Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: I would like to arrive by 9:30. Sentence2: The price of the train is 16.60 pounds. Sentence3: You as well, goodbye. Sentence4: Yes, they have free parking as well as internet. Would you like to reserve a room? Sentence5: Sure, the train the arrives closest to that time is TR2715, arrives at 09:07. Shall I book it, if so how many riders are there? Sentence6: Actually, I don't need the room booked. I think we're all set here. Have a good day. Sentence7: Of course, what will the number of guest and the duration of your stay be? Sentence8: Just one. What is the price to book the train? Sentence9: Yes, thank you. Sentence10: I'm looking for a train going to Cambridge. Sentence11: Does the Hamilton Lodge include free parking? Sentence12: I have found the place you are looking for. Its address is 156 chesterton road, would you like me to book a reservation for you? Sentence13: There are over 1000 trains coming to Cambridge. Is there a particular day, time, or point of departure that you're interested in? Sentence14: I want to leave from london liverpool street on tuesday. Sentence15: What time would you like to arrive in Cambridge? Sentence16: Alright, Thanks. I'm also looking for a particular hotel, it's name is Hamilton Lodge. Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System