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

Example Input: Sentence1: Sure, that post code is cb39al. Can I further assist you? Sentence2: I'm interested in visiting colleges while in town, can you please recommend some? Sentence3: I can recommend clare hall and christ's college. You need phone numbers for either one? Sentence4: Okay the TR5009 leaves at 18:40. Sentence5: Yes I also need a train to stansted airport on sunday Sentence6: That sounds great, do I call to book a seat or can you help me? Sentence7: No, thanks. That's all I needed. Sentence8: I'm glad I was able to help you. Thanks for using our service have a nice day. Sentence9: Sure. Where will you be departing from, and what time? Sentence10: Please book for 6 people. Sentence11: I am leaving from Cambridge. I would like to leave sometime after 18:00. Sentence12: I would like the post code for clare hall please. Sentence13: I would be more than happy to help you book! Tickets are 8.08 pounds. How many tickets would you like me to book for your trip? Sentence14: Booking was successful, the fee is 48.48 GBP payable at the station . Reference number is 4ESBHTB0 . Is there anything else I can help you with? Question: Who has spoken the sentence 7? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: So, to clarify, you want a taxi from the University Arms to Bangkok City at 16:00, correct? Sentence2: No, that's all. Thank you. Sentence3: What price range and in what area? Sentence4: What type of hotel is the University Arms? Sentence5: its postcode is cb21ad. is that all? Sentence6: It's a 4 star hotel. In the centre and expensive as you requested. Sentence7: I am looking for an expensive place in the centre area with free wifi? Sentence8: I would like to book a taxi that can commute to both places, It would need to arrive by the booked time. Please provide contact and the car type. Sentence9: Your cuisine options are: British, European, Indian, and Thai. Sentence10: Yes I would like a table for 4 people at 16:00 on Saturday. Sentence11: Reference number is : FJVATJEE . Is there anything else? Sentence12: I'm sorry, make that the centre of town. A Thai restaurant would be fine. Sentence13: Yes, thank you. Sentence14: I found Bangkok City. Would you like me to book a table? Sentence15: Have a nice day. Sentence16: I am looking for something expensive in the west please. Sentence17: I have two options. The Gonville Hotel which has three stars, and the University Arms Hotel which has four stars. Would you like to make a booking? Sentence18: Done! You'll be picked up in a yellow Tesla, and the contact number is 07044662222. Can I help you with anything else? Sentence19: Can you help me locate a place to eat tonight? Sentence20: No thank you. What is the University Arms Hotel's postcode? Question: Who has spoken the sentence 17? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I would like to book it for Thursday for 8 people for 13:45. Sentence2: No, it should be in the moderate price range and include free wiki, though. Sentence3: Can I help with anything else today? Sentence4: Yes, can you book for 8 people, 3 nights, starting on thursday. Sentence5: what about the one on the cheap range? Sentence6: Nope, that's it, thanks! Sentence7: Yes I have two options for you. Would you like to book one of these? Sentence8: I'm visiting cambridge and I need a place to stay. I'm looking for a 0 star guesthouse. Sentence9: thanks i'm also looking for a restaurant. Sentence10: Thank you so much! Sentence11: Booking was successful. The table will be reserved for 15 minutes. Reference number is : KUWF73DZ . Sentence12: What day would you like to book that for? Sentence13: I'd be happy to help you. What kind of cuisine are you wanting to try? Sentence14: I'm so sorry but we don't have anything that exactly matches that. Since you want a 0 star how about a cheap guesthouse called el shaddai in the centre? Sentence15: Glad I was able to help you. Have a good day. Sentence16: I have made a booking for you for city centre north b and b. Your reference number is K9NGVLIT . Sentence17: I have two options. One in the north and one in the center. Do you have a preference? Sentence18: i am actually looking to book a restaurant called riverside brasserie. Question: Who has spoken the sentence 16? (A) User (B) System
Example Output:
Answer: (A) User