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

Example input: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Example output: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system
Q: Sentence1: 6 people, five nights, starting on Thursday, please. Sentence2: I'm sorry, I made a mistake! I need for it to start on Tuesday not Thursday!!!! Can you fix that for me??? Sentence3: Yes, it does. Sentence4: Would you like me to book the room now? Sentence5: The entrance fee is 5 pounds. Phone number is 01223368650. And the postcode is cb58ld. Sentence6: I'd like an expensive hotel please. Sentence7: Do you need to arrange transportation to town, or between any venues? If not, it was my pleasure to help you and have a great day! Sentence8: I'm looking for a place to stay in the centre. I also need free wifi there. Sentence9: Yes please book that. Sentence10: OK, you're all set. 6 people for 5 nights at University Arms. Arriving on Thursday. Your Reference number is : TXXXCWJD . Is there anything else I can do today? Sentence11: That's perfect. Thank you so much. Sentence12: Okay, have a great day! Bye now! Sentence13: Yes the university arms would you be able to book that? Sentence14: No, thank you. I think that's it. Sentence15: What's the entrance fee, phone number, and postcode for that museum? Sentence16: We have two guesthouses and three hotels in town centre. Do you have a pricerange in mind? Sentence17: does cambridge museum of technology still open? Sentence18: No problem! I switched that reservation to Tuesday instead of Thursday for you and your new reference number is M7VCVOT6 . Can I help with anything else? Sentence19: Yes certainly. How many nights will you be needing and when will you be arriving and how many people will be staying? Sentence20: There are two expensive hotels in the area of Centre. The Gonville has a 3 star rating and the University Arms has 4. Do you have a preference? Question: Who has spoken the sentence 15? (A) User (B) System
A:
Answer: (B) System