[example] [user] i would like to find a train. [system] where are you departing from and what is your destination? [user] i'm leaving washington to chicago on march 6th. [system] there are 5 trains. there is one leaving at 9:40 am for $109. [user] i would like to purchase one ticket. flexible ticket, and add travel insurance. [slots] from=washington journey_start_time=9:40 am to=chicago date_of_journey=march 6th number_of_adults=c of possible values a) 3 b) 4 c) 1 d) 5 e) 2 class=c of possible values a) value b) business c) flexible trip_protection=a of possible values a) true b) false [context] [user] i'd like train tickets for next thursday. i'll be going to san diego.
State: [state] from=none journey_start_time=none to=san diego date_of_journey=next thursday number_of_adults=none class=none trip_protection=none

[example] [user] i would like to find a train. [system] where are you departing from and what is your destination? [user] i'm leaving washington to chicago on march 6th. [system] there are 5 trains. there is one leaving at 9:40 am for $109. [user] i would like to purchase one ticket. flexible ticket, and add travel insurance. [slots] to=chicago trip_protection=b of possible values a) false b) true class=a of possible values a) flexible b) business c) value journey_start_time=9:40 am from=washington number_of_adults=e of possible values a) 5 b) 3 c) 4 d) 2 e) 1 date_of_journey=march 6th [context] [user] i'd like train tickets for next thursday. i'll be going to san diego. [system] where are you coming from? [user] i'm coming from phoenix, az. i'll need 3 tickets.
State: [state] to=san diego trip_protection=none class=none journey_start_time=none from=phoenix, az number_of_adults=b date_of_journey=next thursday

[example] [user] i would like to find a train. [system] where are you departing from and what is your destination? [user] i'm leaving washington to chicago on march 6th. [system] there are 5 trains. there is one leaving at 9:40 am for $109. [user] i would like to purchase one ticket. flexible ticket, and add travel insurance. [slots] to=chicago trip_protection=a of possible values a) true b) false date_of_journey=march 6th from=washington journey_start_time=9:40 am class=c of possible values a) value b) business c) flexible number_of_adults=a of possible values a) 1 b) 5 c) 2 d) 4 e) 3 [context] [user] i'd like train tickets for next thursday. i'll be going to san diego. [system] where are you coming from? [user] i'm coming from phoenix, az. i'll need 3 tickets. [system] i've found 5 trains. one's departing at 8:30 am and costs $199. [user] that's a good one. that's all.
State: [state] to=san diego trip_protection=none date_of_journey=next thursday from=phoenix, az journey_start_time=8:30 am class=none number_of_adults=e