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

Sentence1: I need to depart from kings lynn on Wednesday and arrive by 9:15. Sentence2: I'd like some information on the Hamilton Lodge hotel, please. Sentence3: I need to depart from kings lynn on the same day as the hotel booking. Sentence4: Enjoy your visit to cambridge. Have a wonderful day. Sentence5: It is located in the north. It is a guesthouse and is in the moderate price range. Would you like a reservation? Sentence6: Enjoy your stay at Cambridge. Sentence7: We have several trains going to Cambridge. Where will you be departing from and what date do you need the train? Sentence8: Booking was successful. Address is 156 chesterton road. Postcode is cb41da. Reference number is: RU5ZSYZS . Anything else I can help you with? Sentence9: I actually won't need a reservation, just the information you provided is enough. Thank you. Have a good day. Bye. Sentence10: How about the TR4638 train? It arrives at 08:58. Sentence11: Can you tell me when that departs and the total travel time? Also, how much is it? Sentence12: Yes, I would like to book for 6 people for 4 nights starting on Wednesday. Sentence13: Thank you for all your help. Sentence14: Yes, I need a train to cambridge Sentence15: Is there a specific time you would like to leave or arrive by? Sentence16: TR4638 leaves at 8:11 and arrives at 8:58 that's a travel time of 47 minutes. The cost is 9.80 pounds. Would you like me to make reservations? Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User