[example] [user] i need one 1-star hotel room with wifi please. [system] what city would you like to stay? [user] i need it in san francisco [system] i have 8 options for you. beck's motor lodge is a 1 star. [user] that sounds good. can you reserve for 2 days? [system] when would you like to check in? [user] i need it on the 11th of march. [slots] hotel_name=beck's motor lodge number_of_days=2 check_in_date=11th of march destination=san francisco number_of_rooms=a of possible values a) 1 b) 2 c) 3 star_rating=d of possible values a) 2 b) 3 c) 5 d) 1 e) 4 has_wifi=a of possible values a) true b) false [context] [user] i would like to book a hotel please.
State: [state] hotel_name=none number_of_days=none check_in_date=none destination=none number_of_rooms=none star_rating=none has_wifi=none

[example] [user] i need one 1-star hotel room with wifi please. [system] what city would you like to stay? [user] i need it in san francisco [system] i have 8 options for you. beck's motor lodge is a 1 star. [user] that sounds good. can you reserve for 2 days? [system] when would you like to check in? [user] i need it on the 11th of march. [slots] hotel_name=beck's motor lodge star_rating=e of possible values a) 5 b) 4 c) 2 d) 3 e) 1 check_in_date=11th of march number_of_rooms=c of possible values a) 2 b) 3 c) 1 has_wifi=a of possible values a) true b) false destination=san francisco number_of_days=2 [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central.
State: [state] hotel_name=hampton inn manhattan/times square central star_rating=none check_in_date=none number_of_rooms=none has_wifi=none destination=none number_of_days=none

[example] [user] i need one 1-star hotel room with wifi please. [system] what city would you like to stay? [user] i need it in san francisco [system] i have 8 options for you. beck's motor lodge is a 1 star. [user] that sounds good. can you reserve for 2 days? [system] when would you like to check in? [user] i need it on the 11th of march. [slots] number_of_rooms=a of possible values a) 1 b) 2 c) 3 star_rating=d of possible values a) 3 b) 5 c) 2 d) 1 e) 4 check_in_date=11th of march number_of_days=2 destination=san francisco hotel_name=beck's motor lodge has_wifi=b of possible values a) false b) true [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week.
State: [state] number_of_rooms=none star_rating=none check_in_date=monday next week number_of_days=none destination=new york hotel_name=hampton inn manhattan/times square central has_wifi=none

[example] [user] i need one 1-star hotel room with wifi please. [system] what city would you like to stay? [user] i need it in san francisco [system] i have 8 options for you. beck's motor lodge is a 1 star. [user] that sounds good. can you reserve for 2 days? [system] when would you like to check in? [user] i need it on the 11th of march. [slots] star_rating=c of possible values a) 2 b) 3 c) 1 d) 4 e) 5 hotel_name=beck's motor lodge number_of_rooms=a of possible values a) 1 b) 3 c) 2 check_in_date=11th of march number_of_days=2 destination=san francisco has_wifi=b of possible values a) false b) true [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn.
State: [state] star_rating=none hotel_name=aloft new york brooklyn number_of_rooms=none check_in_date=monday next week number_of_days=four destination=new york has_wifi=none

[example] [user] i need one 1-star hotel room with wifi please. [system] what city would you like to stay? [user] i need it in san francisco [system] i have 8 options for you. beck's motor lodge is a 1 star. [user] that sounds good. can you reserve for 2 days? [system] when would you like to check in? [user] i need it on the 11th of march. [slots] destination=san francisco number_of_rooms=c of possible values a) 2 b) 3 c) 1 star_rating=a of possible values a) 1 b) 4 c) 2 d) 3 e) 5 has_wifi=a of possible values a) true b) false check_in_date=11th of march hotel_name=beck's motor lodge number_of_days=2 [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night?
State: [state] destination=new york number_of_rooms=c star_rating=none has_wifi=none check_in_date=march 4th hotel_name=aloft new york brooklyn number_of_days=4

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] seating_class=dontcare of possible values a) first class b) business c) economy d) premium economy refundable=b of possible values a) false b) true passengers=d of possible values a) 3 b) 2 c) 4 d) 1 inbound_departure_time=8:25 pm origin_city=las vegas airlines=f of possible values a) american airlines b) delta airlines c) alaska airlines d) air canada e) air france f) southwest airlines g) united airlines h) british airways destination_city=sd outbound_departure_time=3:10 pm return_date=9th of this month departure_date=6th of this month [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there?
State: [state] seating_class=none refundable=none passengers=none inbound_departure_time=none origin_city=none airlines=none destination_city=new york outbound_departure_time=none return_date=none departure_date=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] airlines=f of possible values a) united airlines b) alaska airlines c) air canada d) american airlines e) delta airlines f) southwest airlines g) air france h) british airways destination_city=sd return_date=9th of this month seating_class=dontcare of possible values a) premium economy b) business c) economy d) first class outbound_departure_time=3:10 pm origin_city=las vegas passengers=a of possible values a) 1 b) 4 c) 3 d) 2 inbound_departure_time=8:25 pm departure_date=6th of this month refundable=a of possible values a) true b) false [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax.
State: [state] airlines=none destination_city=new york return_date=none seating_class=none outbound_departure_time=none origin_city=lax passengers=none inbound_departure_time=none departure_date=later today refundable=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] seating_class=dontcare of possible values a) economy b) first class c) premium economy d) business return_date=9th of this month passengers=c of possible values a) 3 b) 4 c) 1 d) 2 origin_city=las vegas inbound_departure_time=8:25 pm airlines=f of possible values a) air france b) british airways c) american airlines d) united airlines e) air canada f) southwest airlines g) alaska airlines h) delta airlines outbound_departure_time=3:10 pm departure_date=6th of this month destination_city=sd refundable=a of possible values a) true b) false [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do.
State: [state] seating_class=none return_date=none passengers=none origin_city=lax inbound_departure_time=none airlines=dontcare outbound_departure_time=none departure_date=later today destination_city=new york refundable=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] return_date=9th of this month inbound_departure_time=8:25 pm destination_city=sd airlines=e of possible values a) united airlines b) air france c) delta airlines d) american airlines e) southwest airlines f) alaska airlines g) air canada h) british airways refundable=b of possible values a) false b) true outbound_departure_time=3:10 pm origin_city=las vegas departure_date=6th of this month passengers=d of possible values a) 2 b) 3 c) 4 d) 1 seating_class=dontcare of possible values a) first class b) economy c) premium economy d) business [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive?
State: [state] return_date=none inbound_departure_time=none destination_city=new york airlines=dontcare refundable=none outbound_departure_time=none origin_city=lax departure_date=later today passengers=none seating_class=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] outbound_departure_time=3:10 pm departure_date=6th of this month inbound_departure_time=8:25 pm origin_city=las vegas destination_city=sd airlines=f of possible values a) british airways b) united airlines c) american airlines d) delta airlines e) air canada f) southwest airlines g) alaska airlines h) air france seating_class=dontcare of possible values a) business b) premium economy c) first class d) economy return_date=9th of this month passengers=c of possible values a) 4 b) 3 c) 1 d) 2 refundable=a of possible values a) true b) false [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options?
State: [state] outbound_departure_time=none departure_date=later today inbound_departure_time=none origin_city=lax destination_city=new york airlines=dontcare seating_class=none return_date=none passengers=none refundable=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] passengers=a of possible values a) 1 b) 4 c) 3 d) 2 seating_class=dontcare of possible values a) business b) first class c) economy d) premium economy departure_date=6th of this month refundable=a of possible values a) true b) false origin_city=las vegas return_date=9th of this month outbound_departure_time=3:10 pm airlines=b of possible values a) american airlines b) southwest airlines c) air canada d) alaska airlines e) delta airlines f) british airways g) united airlines h) air france destination_city=sd inbound_departure_time=8:25 pm [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options? [system] there is a delta airlines flight with 0 stops, leaving at 10:55 pm and costing $186. [user] when will the flight arrive?
State: [state] passengers=none seating_class=none departure_date=later today refundable=none origin_city=lax return_date=none outbound_departure_time=none airlines=dontcare destination_city=new york inbound_departure_time=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] airlines=b of possible values a) united airlines b) southwest airlines c) air canada d) british airways e) delta airlines f) american airlines g) alaska airlines h) air france seating_class=dontcare of possible values a) first class b) business c) economy d) premium economy return_date=9th of this month passengers=b of possible values a) 4 b) 1 c) 3 d) 2 refundable=b of possible values a) false b) true departure_date=6th of this month origin_city=las vegas destination_city=sd outbound_departure_time=3:10 pm inbound_departure_time=8:25 pm [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options? [system] there is a delta airlines flight with 0 stops, leaving at 10:55 pm and costing $186. [user] when will the flight arrive? [system] it arrives at 8:05 am. [user] that suits me fine, can you help me to buy the ticket, i need four.
State: [state] airlines=e seating_class=none return_date=none passengers=a refundable=none departure_date=later today origin_city=lax destination_city=new york outbound_departure_time=10:55 pm inbound_departure_time=none

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] passengers=c of possible values a) 2 b) 3 c) 1 d) 4 refundable=b of possible values a) false b) true inbound_departure_time=8:25 pm airlines=a of possible values a) southwest airlines b) delta airlines c) air france d) british airways e) american airlines f) air canada g) alaska airlines h) united airlines outbound_departure_time=3:10 pm departure_date=6th of this month return_date=9th of this month seating_class=dontcare of possible values a) economy b) business c) premium economy d) first class origin_city=las vegas destination_city=sd [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options? [system] there is a delta airlines flight with 0 stops, leaving at 10:55 pm and costing $186. [user] when will the flight arrive? [system] it arrives at 8:05 am. [user] that suits me fine, can you help me to buy the ticket, i need four. [system] to confirm then that is 4 economy tickets from los angeles to new york, flying with delta airlines on march 1st. [user] yes that is correct.
State: [state] passengers=d refundable=none inbound_departure_time=none airlines=b outbound_departure_time=10:55 pm departure_date=march 1st return_date=none seating_class=a origin_city=lax destination_city=new york

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] inbound_departure_time=8:25 pm refundable=a of possible values a) true b) false airlines=f of possible values a) alaska airlines b) american airlines c) air france d) air canada e) united airlines f) southwest airlines g) delta airlines h) british airways outbound_departure_time=3:10 pm seating_class=dontcare of possible values a) premium economy b) business c) economy d) first class origin_city=las vegas passengers=b of possible values a) 3 b) 1 c) 4 d) 2 destination_city=sd return_date=9th of this month departure_date=6th of this month [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options? [system] there is a delta airlines flight with 0 stops, leaving at 10:55 pm and costing $186. [user] when will the flight arrive? [system] it arrives at 8:05 am. [user] that suits me fine, can you help me to buy the ticket, i need four. [system] to confirm then that is 4 economy tickets from los angeles to new york, flying with delta airlines on march 1st. [user] yes that is correct. [system] your booking is confirmed. [user] which airport will we be leaving from?
State: [state] inbound_departure_time=none refundable=none airlines=g outbound_departure_time=10:55 pm seating_class=c origin_city=lax passengers=c destination_city=new york return_date=none departure_date=march 1st

[example] [user] please search flights for me. i m leaving from las vegas on the 6th of this month and coming back on the 9th of this month. [system] where are you going? [user] i am going to sd. there is only 1 in my group. make sure to book only refundable tickets. either business or economy is fine. [system] i found a convenient southwest airlines flight for your trip. it leaves at 3:10 pm and the return flight leaves at 8:25 pm. the ticket price is $95. [user] that flight sounds good to me. [slots] departure_date=6th of this month airlines=e of possible values a) united airlines b) alaska airlines c) british airways d) delta airlines e) southwest airlines f) air canada g) air france h) american airlines return_date=9th of this month destination_city=sd passengers=b of possible values a) 2 b) 1 c) 3 d) 4 inbound_departure_time=8:25 pm outbound_departure_time=3:10 pm origin_city=las vegas seating_class=dontcare of possible values a) premium economy b) economy c) business d) first class refundable=a of possible values a) true b) false [context] [user] i would like to book a hotel please. [system] which hotel are you interested in? [user] the hampton inn manhattan/times square central. [system] which city do you require and what date will you be arriving? [user] in new york monday next week. [system] how many days will you be staying? [user] four days, could you check aloft new york brooklyn. [system] to confirm that is 1 room for 4 days from march 4th in aloft new york brooklyn in new york city. [user] yes that suits me. how much will it be per night? [system] $63 per night and that is booked for you now. [user] can i find a flight to go there? [system] where are you travelling from and will i check for march 4th? [user] i am leaving later today from lax. [system] there are 5 possible options for you. there is one flight with alaska airlines with 0 stops leavig at 9:30 am costing $197. [user] are there any other options, any airline will do. [system] there is an american airlines flight leavig at 6:20 pm wih 0 stops costing $210. [user] when will the flight arrive? [system] at 3:30 am. [user] are there any other options? [system] there is a delta airlines flight with 0 stops, leaving at 10:55 pm and costing $186. [user] when will the flight arrive? [system] it arrives at 8:05 am. [user] that suits me fine, can you help me to buy the ticket, i need four. [system] to confirm then that is 4 economy tickets from los angeles to new york, flying with delta airlines on march 1st. [user] yes that is correct. [system] your booking is confirmed. [user] which airport will we be leaving from? [system] from lax international airport. [user] thanks for helping, that is everything for now.
State: [state] departure_date=march 1st airlines=d return_date=none destination_city=new york passengers=d inbound_departure_time=none outbound_departure_time=10:55 pm origin_city=lax seating_class=b refundable=none