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

Sentence1: OK, I've booked 4 people at The Cambridge Belfry for 4 nights starting Monday, the reference number is WZ83NOII . Is there anything else I can help you with? Sentence2: I'm sorry, I don't actually need the tickets right now. Can you find me a moderately priced 4 star hotel, though? Sentence3: We have 4 star hotels in the cheap and expensive price range, could I interest you in one of those? Sentence4: Yes no later than 5:15 I have to be there by 20:20. Sentence5: No, as long as the hotel itself is a 4 star establishment I'm not too concerned about where it's located. Sentence6: I can help you with that. Do you have a specific time frame in mind? Sentence7: I have TR1188 leaving at 5:24 and arriving at 5:52. Would you like to book tickets? Sentence8: I need to travel from Stansted Airport to Cambridge on Monday. Sentence9: Is there a certain area you would like to stay in? Sentence10: Please book me a room for 4 the same day at a cheap one you recommend. Thanks Sentence11: I was wondering if you could help me with the train schedule. Sentence12: Have a nice day and enjoy your stay in Cambridge! Sentence13: That is all thanks. Sentence14: Of course. Where would you like to travel? Sentence15: Can you book it for me and get a reference number ? Sentence16: Absolutely! How many tickets do you need? Sentence17: I am sorry I meant to leave after 15:15 so that will be fine. Sentence18: 4 nights please starting on monday. Sentence19: How many nights would you like to stay? Sentence20: The earliest I have is 05:24. Will that work? Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User