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

[Q]: Sentence1: That was a successful booking, your reference number is T6C83P46 . Sentence2: Thank you so much! Sentence3: Not really. Anything would be fine. Sentence4: Yes, please. I'd like to book it for 6 people and 5 nights starting from monday. Sentence5: I'm not too concerned with location, but I would like it to include internet and have a 4 star rating please. Sentence6: Do you have a preferred location or price range? Sentence7: Yes, how about 3 nights? Sentence8: I recommend the Acorn Guest House. Would you like a room there? Sentence9: I'm looking for a guesthouse with free parking. Sentence10: Booking unsuccessful. Want to try for a shorter stay? Sentence11: There are 16 guesthouses that meet those requirements. Any preference on price range? Sentence12: You're so welcome. Thank you. Question: Who has spoken the sentence 1? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Is there any place to eat that serves Indian? Sentence2: Thank you so much. I think that will be it for today. You've been a great help. Goodbye. Sentence3: Yes, please book a table for 8 on Tuesday at 20:15. I'd also like the reference number, please? Sentence4: Yes could you please book that for me for 8 people and provide a reference number for the booking. Sentence5: Which area are you referring to? Sentence6: Which restaurant should I book? There are 5, in the west, that serve Indian food. Sentence7: Can you suggest one that has an expensive price range, please? Sentence8: I am looking to arrive by 17:15 on tuesday. Sentence9: Would you like me to reserve a table? Sentence10: I have the reservation booked at the restaurant. The reference number is 2YCEETCJ . Sentence11: We have many fine restaurants in the west, but I recommend Sala Thong, which serves Thai food. Would you like to book a table? Sentence12: I'm glad I could help. Have a wonderful trip and a wonderful day. Goodbye. Sentence13: Yes please book it for 8 people on tuesday at 20:15 Sentence14: Booking was successful, the total fee is 102.4 GBP payable at the station . Reference number is : AIM1QZ4C . Sentence15: I am looking for a train from Stevenage to Cambridge. Can you help me? Sentence16: I have found you a train that leaves at 15:54 and arrives by 16:43. Would you like this one? Sentence17: I would like it to be in the West of town. Sentence18: Yes, I recommend Tandoori Palace. It meets your specifications. Would you like to book a table? Sentence19: Thank you! I also am looking for a place to eat at in the west area. I would prefer a nice expensive one. Sentence20: Of course! What day would you like to leave and what time would you like to arrive? Question: Who has spoken the sentence 17? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: No, it's located in the centre. Sentence2: I'll be departing from the stansted airport on monday. Sentence3: Thanks for the information, that is all. Sentence4: There are a few available. I highly suggest Cambridge Artworks located on 5 Greens Road. Do you need any information? Sentence5: how about parkside pools? they're pretty fun. Sentence6: And what time were you looking to depart? Sentence7: I'm trying to go to cambridge. Sentence8: I've found TR5754 leaving stansted airport at 11:24 and arriving in cambridge at 11:52. The price is 10.10 pounds, can I book this for you? Sentence9: How about a museum? Sentence10: That won't work then. I need one in the west. Sentence11: Can I look up any attractions, taxi or anything else for you? Sentence12: Is parkside pools on the west side? Sentence13: No. I do need to find a swimming pool in the west. Sentence14: What is your travel destination so I can narrow it down to a useful schedule? Sentence15: No, that is all I need today. Thank you so much. Sentence16: Thank you for using our services. Have a good day. Sentence17: Yes, I am looking for information on train schedules for my upcoming trip. Sentence18: Where will you be departing from? Also, what day will you be traveling? Sentence19: There are no pools in the west, can I run another search for you? Sentence20: Doesn't matter, as long as I arrived by 12:45. Question: Who has spoken the sentence 15? (A) User (B) System
[A]:
Answer: (B) System