Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Yes, I do. I'd like to leave from Birmingham New Street on Monday and arrive in Cambridge. Sentence2: There are 2 which would you like? There is one in the south and the centre Sentence3: Yes, could you make a reservation for 6 and provide me the reference number when complete. Sentence4: Okay thanks, you've been a lot of help. Bye! Sentence5: I need to leave after 16:45 please. Sentence6: All booked for 6! Your reference # is 9WAFMF6U . Anything else I can do for you? Sentence7: And what time would you like to travel on monday? Sentence8: Thank you for contacting us, you have a nice day. Sentence9: TR3130 leaves at 17:40 on Monday from Birmingham New Street to Cambridge. Would you like me to book you a seat? Sentence10: Can you get me the area and postcode for a cinema in Cambridge? Sentence11: I would be happy to help you find a train! I have several options, do you require a particular departure or arrival time? Sentence12: the postcode is cb17dy this is the one for the south area. Sentence13: It doesn't really matter. How about the one in the centre? Sentence14: I need a train from Birmingham new street to Cambridge departing on Monday. Question: Who has spoken the sentence 12? (A) User (B) System
A:
Answer: (A) User