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: Sure. It's called a and b guesthouse, found on 124 tension road and is in the moderate price range. Sentence2: No, indeed. That will be all. Thank you. Sentence3: You have been successfully booked and the reference number is L1M02MWF . Can I help you with anything else? Sentence4: I'd like to go ahead and book that for 1 person, 4 nights starting on Saturday night. I will need the reference number once it's made. Sentence5: You are welcome. Have a very nice day. Sentence6: Yes I have a train leaving from Liverpool Street that will arrive in Cambridge at 19:39. Would you like me to book that for you? Sentence7: Sure, the travel time is 88 minutes, and the price is 13.28 pounds. Would you like to book it, if so how many riders will there be? Sentence8: No that's OK, I'll book it later if I need to. Can you tell me anything about a lodging place named "A and B" something? Sentence9: How long is the travel time, and what is the price for that train please? Sentence10: There are more than 300 trains that arrive in cambridge after 19:30. What day were you looking to travel and from where? Sentence11: I need to get to cambridge after 19:30 Sentence12: I'd be leaving from London Liverpool Street on Saturday. Question: Who has spoken the sentence 8? (A) User (B) System
Output:
Answer: (A) User