Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: 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
Output:
Answer: (A) User