Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: What time do you need to arrive by? Sentence2: I need to catch a train on Thursday, departing from Birmingham New Street. Sentence3: I need to leave after 14:45. Sentence4: Okay and what is your destination please? Sentence5: I have the TR2148 that leaves at 15:40 for 75.10 pounds. Would you like to book it? Sentence6: Please specify your choice of time for departure and arrival Sentence7: I am travelling to Cambridge. Sentence8: I don't have an arrival preference. Sentence9: Yes I need 6 tickets and the reference number. Sentence10: Sure thing, I will work on that now and be back with you in a moment. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System