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: Thank you for that info on Avalon. I would like to make a reservation. Sentence2: Okay! For when, how long, and how many people? Sentence3: Okay now can you help me find the Avalon Hotel and tell me whether they have free internet, and where they are located as well as their address? Sentence4: The booking was successful. The total fee of 89.6 GBP can be paid at the station. The reference number is YTB38FE3 . Sentence5: You are welcome, have a great day. Sentence6: There are 70 results for trains going to Stevenage. To narrow the results, what day are you travelling on and what time would you like to arrive? Sentence7: avalon is located at 62 gilbert road in the north. They do have free internet Sentence8: ok, is there anything that leaves earlier than that? Sentence9: I want to reserve for seven people for three nights, please. Sentence10: There is a train that leaves at 11:21. Sentence11: No that'll it for the day. Thank you Sentence12: Could you assist me in finding a train to stevenage please? Sentence13: No, there isn't. Would you like me to book you on the earliest departing train? Sentence14: Thursday, leave after 10:30. Sentence15: Book the 11:21 train for 7 people please. Sentence16: The reservation was successful. Thursday 7 people for 3 nights. The reference number is JBNCTENS . Can I help you with anything else? Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System