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

Sentence1: Yes a hotel that is near that one. Sentence2: Thank you, that's all I need! Sentence3: May I have the reference number for the booking please? Sentence4: I apologize but the booking was unsuccessful, the hotel is booked. Do you want me to check one of the other hotels? Sentence5: Are you looking for a hotel? There are 19 4 star hotels that offer free parking. Do you have a price range or area of town you want to stay? Sentence6: I need a four star room, free parking too. Sentence7: Could I book the Marriot for 4 people starting on Wednesday? It would be for 5 nights. Sentence8: I am sorry. The Huntington Marriott is not available for those days. Would you like to try another hotel? Sentence9: The cambridge bellfry has availability. Will that do? Sentence10: I'd prefer something in the same price range as the Marriott. It's all going on an expense report anyway, no reason to be stingy. Sentence11: The hotel should be in the West side of town. Sentence12: I reserved a room at the expensive 4 star University Arms Hotel. It is in the city centre though. Reference number is A3SLP7HG . Is there anything else today? Sentence13: Is there anything in the same price range you could try? Sentence14: Great. I was happy to help. Good-Bye! Sentence15: There are 3 four star locations to choose from: Finches Bed and Breakfast, the Huntingdon Marriot, and the Cambridge Belfry. The Huntingdon is listed as expensive while the others are cheap. Sentence16: Yes, I will book 5 nights at The Marriot for 4 people starting Wednesday. Anything else I can do for you? Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User