Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Yeah, what's the price and departure time on TR5773? Sentence2: I would like to leave on Monday. Sentence3: Great. What is All Saint's Church's address and postcode, please? Sentence4: That's all I needed. Thank you for your help Sentence5: 09:15 and should depart from cambridge Sentence6: The departure time is 07:36. It is 17.60 pounds. Is there anything else I could help you with? Sentence7: Sounds good. What is their entrance fee? Sentence8: I don't really know. What do you suggest in the city center? Sentence9: There are none that will leave by 09:15 will the 09:36 be ok? Sentence10: Train TR5773 suits your needs. Is there anything else I can help you with today? Sentence11: Actually, I need to arrive by 09:15. Is there anything early morning on Monday from Cambridge to Norwich? Sentence12: They are located at jesus lane, and their postcode is cb58bs Sentence13: Thanks. I am also looking for a train from Cambridge to Norwich, could you help me find one? Sentence14: There are 19 trains that go to norwich from cambridge what time would you like to leave or arrive? Sentence15: Great, have a good day! Sentence16: I show 44 attractions in the centre of Cambridge. Was there a specific type of attraction you were looking for? Sentence17: There is much architecture here worth taking a tour of. I am a fan of All Saint's Church. Sentence18: I'm looking for attractions to go in the centre of Cambridge, please. Sentence19: Entrance to All Saints is free. Sentence20: Sure, there are 133 trains from cambridge to norwich. What day would you like to travel on? Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User