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

[EX Q]: Sentence1: I would prefer one of the expensive places. Need to impress my guests, you know? Sentence2: I see one moderately priced Indian restaurant in that area, and several expensive ones. Do you have a preference? Sentence3: Actually, I would like to book the hotel for 6 people for 4 nights starting on Sunday. Sentence4: I want an expensive place to stay in the west side. Sentence5: Okay, the phone number is 01480446000 for your convenience. Is there anything else I can help you with? Sentence6: There are three expensive Indian Restaurants in that area. Can I recommend Tandoori Palace? Sentence7: Thank you, you have a good day! Sentence8: I don't really need internet, but that sounds like everything else I want. Yes, I'd like you to book it. Sentence9: Yes, is 3 nights possible? Could I also please have a reference number? Sentence10: I was not able to reserve a table for you at that time. Is there a different day or time slot that you would like? Sentence11: Booking was not possible. Would you like to try a shorter stay, fewer rooms, or another day? Sentence12: Great! I have a table for 6 people at 11:30 onSundar at Tandoori Palace, Reference Number 3BMGPAN3 . Is there anything else I can do for you? Sentence13: I will hold off on the booking today I think I have all I need Sentence14: No thank you, that is all I needed! Sentence15: Thank you. I would like to make reservations for my party to have dinner one night near the hotel. We would like to go to a restaurant that serves Indian food, if possible. Sentence16: Great, the booking was successful. Your reference number is HJHE475H . Is there anything else I can help you with? Sentence17: OK, what is your arrival date, number of nights, and number of people in your party? Sentence18: Yes, that sounds good. Please book it for the same 6 people at 12:30 on Sunday. Sentence19: The Huntingdon Marriott Hotel is an expensive, 4-star hotel in the west that offers free internet and parking. Would you like me to book this for you? Sentence20: Yes, how about 11:30 instead? Please send reference number for the booking. Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I'm sorry. I changed my mind. I don't want a guesthouse. Are there any hotels with 2 stars? Sentence2: Great that was all I needed today, thank you. Sentence3: Is there a particular area you would like to stay in? Sentence4: There isn't a guesthouse with 2 stars and free internet available. Is there another type of hotel I can look up for you? Sentence5: Great Glad I could be of help to you. Sentence6: I have you booked in the Ashley hotel. Your reference number is CW6YMT0B . Is there anything else I can do for you today? Sentence7: No, just any 2-star hotel with free wifi will do. Sentence8: Hi, I need a guest house please. Sentence9: Do you have a specific location you want to be? Sentence10: No, but I need free wifi and I would like a 2 star guesthouse please. Sentence11: I have 3 guesthouses all in the moderate price range. Would you like me to choose one for you? Sentence12: I found 3 for you all in the expensive price range. Can you please give me the details so that I may book it for you? Sentence13: Yes, how about a guesthouse with 3 stars and free wifi instead? Sentence14: I would like it for 6 people for 2 nights starting on Wednesday. Question: Who has spoken the sentence 11? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I need to find a hospital nearby that has a hepatobillary and gastrointestinal surgery referral center Sentence2: No, that's it. Thanks! Sentence3: No, I just need the postcode. Sentence4: You're very welcome. Have a great day! Sentence5: Certainly. The postcode is CB20QQ. Anything else I can help you with today? Sentence6: Addenbrookes Hospital located at Hills Rd, Cambridge has that department. Would you like the phone number to that direct department? Question: Who has spoken the sentence 5? (A) User (B) System
[EX A]:
Answer: (B) System