You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

[Q]: Sentence1: Booking was successful for Tuesday. Your Reference number is : 0J3V1091 . Sentence2: I'm sorry that doesn't seem to be available would you like me to try a different day or guesthouse? Sentence3: I'm sorry, there does not seem to be a historical site or hiking area in Cambridge. Is there anything else I can help with? Sentence4: Sure, I can help you with that. What section of town were you looking for? Sentence5: Doesn't really matter if they offer either of those or not. I just want it to be a 0 star hotel. Sentence6: Then the city centre north b and b is what you want, shall I book you? Sentence7: i don't really care about the area. Sentence8: I want to see local sights, can you help? Sentence9: I like hiking and seeing historical sites. Sentence10: Okay. Are you interested in hotels that offer internet and/or parking? Sentence11: Yes, I would like to find a hotel in the cheap price range? Sentence12: Yes, a guesthouse is fine. I was looking for zero stars and in the cheap price range. Sentence13: Great, thanks. I don't need anymore help. Goodbye! Sentence14: Yes, please book it for me. Sentence15: I'm sorry, I seem to be having an error in my system. You want a booking at the citycentre north B&B for 6 people, 5 nights, on Monday? Sentence16: I'm also looking for somewhere to go. Perhaps the college. Can you tell me the postcode for the college? Sentence17: City Cenrtree North and B is a cheap hotel,would you like me to book it for you ? Sentence18: Let book the same but on Tuesday instead. Sentence19: I'm happy I could help today. Goodbye! Sentence20: There are 18 colleges in town. I recommend christ's college in the centre. The postcode is cb23bu. Sentence21: Yes, there is a wide variety, do you have an activity type that your are interested in? Sentence22: Yes please, 6 people for 5 nights and we would be arriving Monday. Question: Who has spoken the sentence 21? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: No thank you. I have everything I need. Sentence2: The earliest train leaving after 11:45 is at 12:09 on friday. Would you like me to book this for you? Sentence3: I need 1 ticket for departure on Thursday. Sentence4: i need a train going to leicester that leaves after 11:45 Sentence5: That is fine. Can I have the train ID once it's booked? Sentence6: Of course, what day will you be traveling, and how many people will be in your party? Sentence7: I was successfully able to book you a reservation for 7. The reference number is R2RPLBI3 . Can I help you with anything else? Sentence8: There is one restaurant called bedouin, but unfortunately it does not have any open reservations for matching your specifications. Could you provide another day or time? Sentence9: Yes I want to reserve a table for 7 people at 15:00 on Thursday at an expensive African restaurant. Can you help me with this? Sentence10: Could you get a reservation at a difference expensive African restaurant? Sentence11: There are no tables available at Bedouin at that time. Would you like to try a different time slot or perhaps a different day? Sentence12: I will be departing leicester going to cambridge, sorry for the confusion. I need to leave after 11:45 also. Sentence13: Sure. If there are no other African eateries to choose from, try the 14:00 at the Bedouin. Sentence14: Sure, are you going to leicester, or to cambridge? What is your departure site please? Sentence15: Great. I have booked you one seat on the 12:09 train from Leicester and your reference number is 7UR3BFW6 . Is there anything else I can do for you? Sentence16: You are welcome. Good bye. Question: Who has spoken the sentence 15? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Yes, can you please and send me the reference number? Sentence2: I need a taxi as well? Sentence3: I need to arrive by 05:15. Sentence4: I also need to know how many days and what day you will be staying. Sentence5: Can you also find a swimming pool I can visit? Sentence6: Alright a yellow volkswagen has been booked it will have you to the pool by 05:15. Your confirmation number is 07422806466. Is there anything else I can assist you with? Sentence7: I need to leave from autumn house to a swimming pool Sentence8: Where is your departure site and destination? Sentence9: Could I get the postcode and entrance fee for the one in the east? Sentence10: 5 days and I need postcode and entrance fee Sentence11: That will be all thank you Sentence12: Have a nice day and thank you for contacting us. Sentence13: Yes, the Autumn House has free parking! Would you like to make a reservation? Sentence14: The Autumn House hotel is a cheap guesthouse on the east side, located at 710 Newmarket Road. Sentence15: Right, as I states above, 5 days please. Sentence16: Ok. How many days will you be staying? Sentence17: I need to find the Autumn House Hotel. Sentence18: I'm afraid I don't have the entrance fee, but the postcode is cb58nt. Can I help with anything else? Sentence19: I would love to help. When would you like to arrive or leave by? Sentence20: There are 2 pools in the north, one in the center and one in the east. Which do you prefer? Sentence21: You are booked. Your reference number is XPCARI17 Sentence22: Do they have free parking there? Question: Who has spoken the sentence 1? (A) User (B) System
[A]:
Answer: (B) System