You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: That same day that the train is. Sentence2: Thank you. I am also looking for a 4 star hotel located on the west side of town. Sentence3: The TR1499 leaves at 17:11. Sentence4: I am looking for information in Cambridge Sentence5: Huntingdon marriott hotel would be great for you. Would you like reservations? Sentence6: There are three 4 star choices in the west part of town. Two cheap and one expensive choice. Do you have a preference? Sentence7: can you book it for 3 and give me the reference number please ? Sentence8: Price doesn't matter but I need it to be a hotel. Sentence9: Booking was successful, the total fee is 23.52 GBP payable at the station. Reference number is : 7FJ6TZUM . Sentence10: Your booking was successful. Your reference number is NK5JAGZB, is there anything else I can help you with today? Sentence11: Actually I need a train to Cambridge from Kings lynn on Saturday after 17:00. Sentence12: That is all I need today. Thank you for all your help! Sentence13: What day would you like your reservations to begin? Sentence14: Great. You are welcome to use this service again should you need it. Sentence15: Yes, please. I will also need the reference number. Sentence16: It will be 3 people and 3 nights Sentence17: I'd love to help. In the future, these hits require more effort. Want something in the north? Sentence18: I'd be happy to help you book that, I will need the day you're arriving, how many people and how many nights? Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System