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 sucks. How about museums in the west? Sentence2: I need to go out tonight - what's the hottest nightclub on the west side? Sentence3: I'd be happy to help, first I'll need more information. Please tell me the day, time and number in your party for your reservation. Sentence4: Yes, please. I would appreciate that. Sentence5: How many people? Sentence6: It will just be me Sentence7: Thanks, what is the postcode and entrance fee for kettles yard? Sentence8: What time did you want to make the reservation for? Sentence9: No that will be all. Thank you. Sentence10: We have 7 different museums in the west part of town. Do you want me to give you a recommendation? Sentence11: The postcode is cb30aq and it is free. Sentence12: Ok, booking was successful. Reference number is : SVJX0QE7 . Can I help with anything else? Sentence13: 18:45 on weds Sentence14: I would suggest kettles yard. Sentence15: There are no nightclubs on the west side of town. Sentence16: I also need to book a table at the royal spice restaurant. Sentence17: It will be for one, Wednesday. Sentence18: You are most welcome! Good bye. Question: Who has spoken the sentence 17? (A) User (B) System
Output:
Answer: (B) System