Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: actually, i'm so stupid. i need a train FROM cambridge. i'm going to broxbourne. Sentence2: Is there anythign else I can help you with today? Sentence3: You have a lot of options. Would you like to narrow it down by departure site, departure time, or arrival time? Sentence4: Is there anything else? Sentence5: Find me a moderately priced place to dine in the west. Sentence6: TR2939 would have an arrival time of 13:01. Would you like to book this train? Sentence7: No thanks, I just wanted to know the arrival time. Sentence8: Ok. I have a table for 7 booked at saint johns chop house. Your reference number is XPKRJXC3 . They will hold the table for 15 minutes. Sentence9: Have a great trip. Sentence10: I have 3 options for you - British, Indian, and Italian. Do you have a preference? Sentence11: I also need a train to cambridge on sunday Sentence12: I am leaving anytime after 11:30 from cambridge to broxbourne, what is the arrival time? Sentence13: No problem, there are lots of options. Did you have a time to leave in mind? Sentence14: No, You have helped with everything I needed. Thanks so much for your time. Bye. Sentence15: How about the British place, I would like to book for 7 people at 13:15 on sunday Sentence16: Excellent, thank you so much. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System