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: I am looking for a train departing from London Kings Cross. Sentence2: Train TR3456 leaves London Kings Cross at 13:17 and arrives in Cambridge at 14:08. Would you like to book this train? Sentence3: I have 70 trains departing from that location, do you have any more information to narrow it down some? Sentence4: Great, I have booked your ticket. Your reference number is : 3TF3UIGP . Sentence5: The ticket price is 23.60 pounds. Travel time on this route is 51 minutes. Would you like me to arrange a booking on this train? Sentence6: Okay thank you for all your help. Sentence7: Yes, that sounds good. Sentence8: Yes, I'd like to go to Cambridge on Tuesday, sometime after 13:15. Sentence9: I think that will work. What is the ticket price and travel time for that train? Sentence10: Have a wonderful day! Sentence11: No, that's all I need today. I appreciate your help. Sentence12: You're quite welcome. Is there anything else I can assist you with today? Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User