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

[EX Q]: Sentence1: No thank you. I do need help finding places to go in town. I'm looking for entertainment in the centre of town. Sentence2: The Alexander bed and breakfast is located in the centre. The phone number is 01223525725. Sentence3: Okay! Just to clarify, from where will you be departing? Sentence4: the address is 56 saint barnabas road Sentence5: what's their address? Sentence6: There are several available. Do you have a preference on if there is a fee or free? Sentence7: I dont see any entertainment in the center of town. Could I try a different area for you? Sentence8: I'd like to stay in a good part of town. Can you please give me the phone number? Sentence9: Okay, how about 2 stars? It does need to include free parking. Sentence10: Great! I have booked a taxi for you. The car will be a yellow audi, and the contact number is 07663388074. Can I help with anything else? Sentence11: ashley hotel is a nice 2 star hotel. Sentence12: Okay, christ's college is free admission. Sentence13: How about a college instead? Sentence14: There are actually no 1-star accommodations anywhere in Cambridge. Sentence15: It is a guesthouse. Want me to book it? Sentence16: Free would be preferable. I also need a taxi. Sentence17: I need a place to stay in Cambridge. It should be either a hotel or guesthouse with 1 star and moderate price range. Can you help me with that? Sentence18: What hotel type is that? Sentence19: I would also like to book a taxi to and from the hotel that leaves by 13:30. Sentence20: I am so sorry. I don't know where my head has been. I need to leave the hotel by 13:30, going to Christ's College. Sentence21: At 4 stars you have many options. What part of town would you like to stay in? Sentence22: you have been of great help thank you Sentence23: How about a hotel with 4 stars instead? Sentence24: I am glad. thanks you too. Question: Who has spoken the sentence 23? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: You're welcome. Goodbye! Sentence2: Sure! Can you book a table for 8 people at 17:30 on Friday? Sentence3: Thank you. That's all I need right now. Bye. Sentence4: No. Choose one for me. Sentence5: There are a total of 14 different expensive Indian restaurants located throughout the city. Is there a particular area of town you would like to eat in? Sentence6: I'd like you to tell me about great Indian restaurants in the area. It's okay if they are expensive. Sentence7: Curry garden has good reviews, would you like to book there? Sentence8: Sure. Your reference number is QLMRQ3H2 . Anything else? Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: How about yu garden? It's expensive and serves chinese food. Sentence2: For 14:00, Booking was successful. The table will be reserved for 15 minutes. Reference number is : NHCRN6DS . Sentence3: I'm planning to visit Cambridge and would like to know the options available for upscale Chinese dining. Sentence4: The Alexander Bed and Breakfast is cheap and in the centre. The postcode is cb12de. To book, I need to know when you'll stay and how many people. Sentence5: That's all I need for now. thanks! Sentence6: Thanks. I'm also looking for a guesthouse that includes free wifi and free parking. Sentence7: No, any price range is fine. Go ahead and book, and get me the postcode. Sentence8: That should be fine. Can you get the reference number? Sentence9: Any part of town will be fine. Sentence10: There are 21 guesthouses that offer those amenities. Do you have a preferred price range? Sentence11: I have several recomendations. Would you care to try Yu Garden? It has great Chinese food, but is expensive. Sentence12: I don't mind an expensive restaurant so that will be fine. I would like to reserve a table for 3 on Sunday at 15:00. Sentence13: Unfortunately there are no reservations left at that time. Would you like to change the restaurant? Sentence14: Do you have reservations for 14:00 for Yu Garden since the 15:00 is full? Sentence15: Certainly. What area of town do you prefer? Sentence16: Great! Thanks for using Cambridge TownInfo. Goodbye! Question: Who has spoken the sentence 12? (A) User (B) System
[EX A]:
Answer: (A) User