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: There is an 11:29 that will arrive by 12:07 for 10.10 pounds. Does that sound good? Sentence2: The Train ID is TR6834. Sentence3: I have about 7 different places that serve british food. I have mostly expensive and moderately priced places. Do you have a preference? Sentence4: I am departing from Bishops Stortfod on Friday. I can leave after 9:45 Sentence5: I am happy to help, where are you coming from and on what day? Sentence6: I would recommend the the oak bistro, which is located at 6 Lensfield Road. Would you be interested in making a reservation? Sentence7: Yes, please. I need the reservation to be for 5 people at 21:00 on Friday. Sentence8: Can you book it for me and get a reference number ? Sentence9: Hi, I'm looking for a train for my upcoming trip to Cambridge. Can you help me find one? Sentence10: Thank you I was also hoping to find a british place to eat in the centre. Sentence11: Lets do a moderate one. Which would you recommend? Sentence12: I need the train ID Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System