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

Example Input: Sentence1: book a table for 6 people at 11:15 on tuesday at the Hakka Sentence2: Sure what type of food are you wanting to eat? Sentence3: Do they have free wifi? Sentence4: I booked the taxi, it is a yellow tesla the contact number is 07809860598. Is there anything else I can assist with today? Sentence5: I will need a taxi to get to the restaurant. Sentence6: Booking was successful, and your reference number is TDVD6XSM . Is there anything else I can assist you with? Sentence7: That is all, thank you for your help. Sentence8: The Hamilton Lodge sounds perfect for you. Would you like to know more? Sentence9: I'm glad we were able to help. Sentence10: I would like to find an expensive restaurant in the north part of Cambridge. Sentence11: Yes, they do have internet. Shall I make a booking? Sentence12: There 2 of them - the Hakka and the hotpot. Which one would you like to try? Sentence13: Yes please. I want 4 nights from tuesday, and for 6 people. Give me the reference number too. Sentence14: I am looking for a hotel in the same area that has free parking. Sentence15: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 48WF5G7X . Can I help with anything else? Sentence16: How about chinese food? Question: Who has spoken the sentence 15? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Yes I need a table for two. Sentence2: No there isn't. Sentence3: What day and time would you like the booking for? Sentence4: Zizzi Cambridge please Sentence5: I'm sorry could you confirm what restaurant you wanted to reserve a table for 2 at? Sentence6: That sounds good can you please give me the address and phone number? Sentence7: thanks for booking the reservation. Goodbye. Sentence8: How about this Tuesday at 17:00? I can check if they have any available tables. Sentence9: Sure thing! Zizzi Cambridge contact info: Phone: 01223365599 Postcode: cb21ab Address: 47-53 Regent Street. Would you like me to make a reservation there? Sentence10: Sure that sounds good. Sentence11: There are 5 cheap Italian restaurants. Is there a particular area you're interested in? Sentence12: Hello I am looking for a restaurant that serves Italian food and I need it to be cheap. Sentence13: How about something local, such as Zizzi Cambridge? It's located at the centre. Sentence14: I don't know. Question: Who has spoken the sentence 7? (A) User (B) System
Example Output: Answer: (B) System

Example Input: 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
Example Output:
Answer: (B) System