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: Thank you that is all I need. Sentence2: I want to find a guesthouse place to stay with a 3 star rating. Sentence3: Any area is fine I just need info for anyplace where a booking is available. Sentence4: I'll need to arrive by 09:30. Sentence5: Can I cancel the reservation with you? Sentence6: Yes I need it for 3 people for 5 nights starting from Monday. Sentence7: All right, I'm glad that I could be of help! Sentence8: We have 3 trains that match that criteria. One leaves at 05:01, another at 06:01 and another at 23:01. Which one would you like me to book for you? Sentence9: I cannot cancel the reservation but you can call to do so at 01223365664. Sentence10: May I ask what day you would be traveling? And where are you wanting to go to? Sentence11: That arrives at 08:44, which means you'd have about 45 minutes before 09:30. Will that work for you? Sentence12: I also need a train. Leaving from Cambridge. Sentence13: Can I get your booking information so I can check them for availability? Sentence14: The Hamilton Lodge has availability. I went ahead and booked that stay for you. I can always cancel if you change your mind. Your reference number is XFD6ZAFT . Sentence15: That sounds perfect. I need that for 3 people. Sentence16: I would like to leave on Wednesday and I'm going to Birmingham New Street. Sentence17: There are four to choose from. Do you prefer the north, south, or west? Sentence18: Booking was successful, the total fee is 225.3 GBP payable at the station .Reference number is : SEX3RXHL . Sentence19: what time does the one that leaves at 06:01 arrive in birmingham new street? Sentence20: what about TR1773? it leaves at 09:01 Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User