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

Sentence1: I would like 2 tickets please. Sentence2: That would be 19.6 GBP payable at the station. The reference number is 7XTP6M2A . Is there anything else I could help you with? Sentence3: Yes, there are a lot of options. Do you know what station you'd like to travel in to or out of? Sentence4: From Cambridge to Kings Lynn please. Sentence5: I have the places info here, what may I help you with? Sentence6: Thank you. That will be everything I need today. Sentence7: I need to book the hotel for 2 people for 2 nights starting on Saturday. Sentence8: You're welcome. Have a great day! Sentence9: TR3566 is the first train leaving cambridge to kings lynn on monday. it departs at 11:11 and arrives at 11:58. How amny tickets would you like to book? Sentence10: OK, thank you! I am also looking for a train for monday that leaves after 10:15, could you help me with that? Sentence11: Okay, you've been booked! Your reference number is GPU1Z9PM . Sentence12: Hi there. I'm looking for a particular hotel called the A and B Guest House. Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User