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

Sentence1: I need help finding a train that will depart on Saturday. Sentence2: I found one boat attraction. Camboats located at the plough, green end, fen ditton. Sentence3: I am going to Cambridge and leaving from Stevenage. Sentence4: I have train TR9925 leaving at 7:21 ad arriving at 8:10 and the cost is 10:24 pounds. Would you like reservations? Sentence5: I have seven trains available. What time do you want to leave? Sentence6: Have a great time. Sentence7: The train should arrive by 18:45 and should leave on saturday. Sentence8: Okay we have a lot of trains departing on Saturday. Where are you headed and where are you departing from? Sentence9: by 18:45 please. Sentence10: Yes please. Also I am looking for a concerthall in the east. If there are none available, how about a boat attraction. Sentence11: I think that is all I need. Thank you. Sentence12: What time do you need to arrive? Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User