You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: That'll do. I need 8 tickets. Sentence2: no but we have one leaving at 16.09 Sentence3: Thanks a lot for the service. Sentence4: I am going to cambridge for a one week holiday. I need to take a train from Leicester on Sunday. Sentence5: That's all, thank you so much! Sentence6: Is there a train leaving after 15:30 on Sunday? Sentence7: Sure the post code is cb22ad,phone number 01223302580,and the entrance fee is free. Sentence8: Thanks! i'm also looking for something to do in town, in the south. Sentence9: A college please. Sentence10: Yes, there are two. Sheep's Green and Lammas Land Park and Wandlebury Country Park. Do you have a preference? Sentence11: What kind of attraction are you interested in ? Sentence12: There are no colleges in the south to visit. How about a museum instead? Byard Art is fantastic! Would you like some more information on it? Sentence13: Wow, thanks. I might check them out later but the people I'm with think we should have a picnic in the park. Are there any in the south? Sentence14: I have several trains to bring you to Cambridge, the first one leaving Leicester at 5:09. Would that work for you? Sentence15: Okay. Your booking was successful. Your total fee is 241.92 GBP which can be paid at the station. The reference number is KZ0FFG5R . Sentence16: Is there anything else I may help you with? Sentence17: Thank you, enjoy the rest of your day. Sentence18: Lammas Land Park sounds like fun. Can you give me the post code, phone number and entrance fee please? Question: Who has spoken the sentence 13? (A) User (B) System
Output:
Answer: (B) System