Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Would you prefer a guest house or hotel? Sentence2: No problem, how many nights will you be staying? Sentence3: Perfect. I am also looking for a place to stay with free parking Sentence4: Train TR0552 arrives by 10:10 the ticket price is 12.80 pounds and the travel time is 49 minutes. Sentence5: Not really. I need to know how much a ticket costs and how long it travels. Sentence6: Well, I am planning a trip and need some help with a train. Sentence7: I'm not sure of that yet. It does need to be in the north. Sentence8: I weill departing on thursday from cambridge and need to arrive by 10:30 in stevenage. Sentence9: I have three, leaving between 5:21 and 9:21. Do you have a preference? Sentence10: Of course, do you know your departure location and time? Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System