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'm sorry. I changed my mind. I don't want a guesthouse. Are there any hotels with 2 stars? Sentence2: Great that was all I needed today, thank you. Sentence3: Is there a particular area you would like to stay in? Sentence4: There isn't a guesthouse with 2 stars and free internet available. Is there another type of hotel I can look up for you? Sentence5: Great Glad I could be of help to you. Sentence6: I have you booked in the Ashley hotel. Your reference number is CW6YMT0B . Is there anything else I can do for you today? Sentence7: No, just any 2-star hotel with free wifi will do. Sentence8: Hi, I need a guest house please. Sentence9: Do you have a specific location you want to be? Sentence10: No, but I need free wifi and I would like a 2 star guesthouse please. Sentence11: I have 3 guesthouses all in the moderate price range. Would you like me to choose one for you? Sentence12: I found 3 for you all in the expensive price range. Can you please give me the details so that I may book it for you? Sentence13: Yes, how about a guesthouse with 3 stars and free wifi instead? Sentence14: I would like it for 6 people for 2 nights starting on Wednesday. Question: Who has spoken the sentence 11? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: The phone number is 01223420060 and the post code is cb46az. Sentence2: Ok. I booked four tickets for you. Your reference number is FRSZ5A8R . Can I help you with something else? Sentence3: Yes. Book for 4 people. Sentence4: I would like the phone number and postcode for it please. Sentence5: What information are you looking for? Sentence6: Sounds great, before i let you go, I just want to make sure we have covered everything that you need. Sentence7: yes you did Sentence8: TR6806 will leave at 10:01 and arrive at 11:01. The trip will take 60 minutes and it will cost 17.90 pounds. Would you like to book? Sentence9: Thank you! That's all I needed, thanks so much. Sentence10: enjoy your stay in Cambridge! Sentence11: I'm going from cambridge to broxbourne any time after 09:15. Sentence12: I show 404 rail departures on Thursday, can I get something specific for you? Sentence13: I want a train leaving on thursday. Sentence14: Im also looking for a place by the name of milton county park. Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: I found three, one leaving at 21:40, 22:40, and 23:40 which would you like to go? Sentence2: I wish to go to New York City leaving this Friday. Sentence3: You're welcome - safe travels! Sentence4: How about Thai food? Sentence5: Unfortunately no table is available at that time do you have another time? Sentence6: What is your destination and day of travel? Sentence7: Alright, I have you booked at Sala Thong at 12:15. Reference number is: QIH3G407 . Can I help you with anything else? Sentence8: How many people will be dining? Sentence9: No, that should be everything. Thank you very much! Sentence10: I'm sorry, but I can't help you with travel outside of Cambridge and the surrounding areas. Sentence11: The one in the west works please. Can you pleas book it for me on the same day at about 13:15. Sentence12: I would like to book the 21:40 train on Wednesday for one person please. I also need a reference number please. Sentence13: Booking was successful, the total fee is 10.1 GBP payable at the station. Your reference number is : VJ3ZAO4F . Is there anything else I can help you with? Sentence14: I'll be dining alone. Sentence15: Could you please check for a table at 12:15 and can I have the reference number? Sentence16: Ok. How about a train to the Stansted airport? Sentence17: There are 2 restaurants that serve thai food; one in the west and one in the centre. Do you have a location preference? Sentence18: I cannot find any restaurant that serves north african food in the area. Sentence19: Yes, I am also looking to eat some north african food. Can you help me find a restaurant? Sentence20: I want to get a train out of Cambridge that departs after 20:45 please. Question: Who has spoken the sentence 16? (A) User (B) System
Example Output:
Answer: (A) User