Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Great! Can I get the phone number? Sentence2: Thanks so much for the train booking. I also need lodging with free wifi. I don't need free parking, though. Sentence3: Either one is fine. If you can recommend for me, that would be great. Oh and if there's one you like that's moderately priced, that would be fine too. Sentence4: Okay, the booking was successful and the total fee is 56.56 GBP payable at the station. The reference number is D2K69PNC . Sentence5: No that won't be necessary. I'd just like the postcode and address please. Sentence6: Their phone number is 01223353071. Would you like me to reserve a room for you? Sentence7: Stansted Airport, please. Sentence8: I have three, is there a star range you prefer? Sentence9: That's all for me. Thanks for your help. Bye! Sentence10: I have a few places available, in which area would you like to stay? Sentence11: I would suggest Avalon. Sentence12: Have a nice day! Sentence13: TR9445 departs at 11:24 and arrives by 11:52. Would you like a ticket? Sentence14: Do have anything expensive? I don't care what area. Sentence15: I want a train going to cambridge. Sentence16: Yes, please. I need a booking for 7 people. Sentence17: They are at 62 gilbert road postal cb43pd, may I assist with anything else? Sentence18: Oh, I don't really care about that. Which place would you recommend? Sentence19: I need to leave on sunday and I need to arrive by 12:15. Sentence20: OK, and what day and time are you traveling? Sentence21: Would you like a hotel or a guesthouse? Sentence22: You're in luck, I have quite a few trains coming into Cambridge! Where will you be departing from? Question: Who has spoken the sentence 15? (A) User (B) System
A:
Answer: (B) System