Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: That will be everything, thank you. Sentence2: Yes, please! And I'll need the reference number. Sentence3: I also need a train. Sentence4: Okay, I can help you with that! Where will you be departing from, and what is your destination? Sentence5: What about 3 nights? Sentence6: Could you be more specific, for example what is the price range you are looking for? Sentence7: I am sorry but Acorn Guest House is heavily booked. Do you want to book for another day or for a shorter stay? Sentence8: Happy to help. Sentence9: I hope you enjoy your stay. Have a good day. Sentence10: Ca I help you with anything else? Sentence11: Booking was successful. Address is 154 chesterton road. Postcode cb41da. Reference number is: IOHUVGA1 . Anything else I can help you with? Sentence12: The first train departing Cambridge after 16:00 is the TR2776, leaving 16:01, arriving in Birmingham, New Street at 18:44. Would you like to book a seat on this one? Sentence13: Price doesn't really matter. I would like free parking though. Sentence14: The booking was successful. Your total is 60.08 GBP, payable at the station. Your reference number is VFIRSFKS Sentence15: Okay good bye. Sentence16: acorn guest house has 4-stars and has free parking. Would like to book it? Sentence17: Thank you very much for your help. Sentence18: Hi there. I could use some help finding a place to stay that is 4 star rated. Sentence19: I need to leave on Sunday after 16:00 please. Sentence20: There are a lot of trains that go that route what day and time do you want to leave or arrive by? Sentence21: Yes, for 1 person for 5 nights starting on thursday. Sentence22: I will be leaving cambridge headed to birmingham new street. Question: Who has spoken the sentence 3? (A) User (B) System
A:
Answer: (B) System