You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

[EX Q]: Sentence1: We have three places that serve international cuisine that you should like. Do you prefer East or Centre? Sentence2: Yes, that would be great. Can you book a table for 4 people at 11:30 on Sunday? Thanks Sentence3: Can you help me find a corsica restaurant? Sentence4: I also need a train that will arrive by 18:15. Sentence5: TR7786 can have you there by 17:51. It costs 23.60 pounds. Sentence6: Sure, which stations are you traveling between? Sentence7: Then can you find me one that serves international food? Sentence8: The Centre is fine. I need a table for brunch on Sunday. Sentence9: I was able to book your party of 4 into Bloomsbury Restaurant on Sunday at 11:30 , Reference: 4ni28yk5 . Can I assist you further today? Sentence10: There is no restaurant serving corsica food in the town. What is another type of food you would like me to search for? Sentence11: What is the travel time? Sentence12: Goodbye, enjoy the rest of your day! Sentence13: The trip takes 51 minutes. Would you like me to book that train for you? Sentence14: I recommend the Bloomsbury Restaurant. It's located at Crowne Plaza Hotel, 20 Downing Street. It's a moderately priced restaurant. Can I book this for you? Sentence15: not now. that is all i needed. have a good day Sentence16: I'll be leaving Cambridge on Monday and I'd like to arrive to London Kings Cross by 18:15. Is there anything available? What time will it leave? Question: Who has spoken the sentence 7? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I need help, i just been the victim of a robbery. Sentence2: You are most welcome! Sentence3: Sure, here it is: Parkside, Cambridge. Sentence4: I am not hurt but I need to get in touch with the police, can you send me the address? Sentence5: Are you hurt? Sentence6: Thank you for your help Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I would really like to stay in the east of town, and preferably an expensive guesthouse if one is available. Sentence2: There are no expensively priced guesthouses in that area, but there are 2 moderately priced ones and 3 cheap ones. Would one of those suit you? Sentence3: I can help you find a nice place to stay. First, did you have a particular area of town you were interested in? Sentence4: Sure! Where will you be departing from? Would you like to depart at a certain time? Sentence5: I'd like to leave from Stevenage and go to Cambridge, it should arrive by 8:45 on the same day as my hotel booking. Sentence6: Booked! Reference number: WQL1WG7F . Sentence7: Thank you! I also need a train that arrives by 08:45 Sentence8: Thanks. I will definitely use your service again. Sentence9: Can you suggest one of the cheap ones? Sentence10: Yes. For one person for 5 nights starting from thursday. Sentence11: I can recommend autumn house at 710 Newmarket Rd. Would you like me to book this for you? Sentence12: You're welcome. Thank you for calling. Good bye. Sentence13: Hello, we're planning on staying in Cambridge and need lodging. We're looking for a guesthouse which has all amenities etc. Price is no problem. Sentence14: I have train TR1044 leaving stevenage at 7:54 and arriving in cambridge 8:43. Would you like me to book that? Sentence15: Thank you for using our service. Have a great day. Sentence16: You're welcome. Is there anything else I could help you with? Sentence17: No, I'm not sure I need the train yet. Thanks for the info! Sentence18: No, that's all I needed. Thanks for your time! Question: Who has spoken the sentence 13? (A) User (B) System
[EX A]:
Answer: (B) System