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

Input: Consider Input: Sentence1: Yes, can I please get the phone number? Sentence2: I would like to commute between Graffiti and Whale of a time. I will be heading to the attraction after eating. Sentence3: Where would you like to be picked up? Sentence4: Can you book it for me and get a reference number ? Sentence5: Just one person, no specific day and time. I'm also looking for a place to go in town in the same area of the restaurant. Sentence6: I have no south african restaurants i the expensive range. Would you like to try another type or price range? Sentence7: In the west area. Sentence8: Can you please recommend one and provide me their phone number? Sentence9: Yes, the phone number is 01954781018. Can I help with any other information today? Sentence10: Is there a certain area you would like? Sentence11: Are there any restaurants serving South African cuisine? Sentence12: Can you book it for me and get a reference number ? Sentence13: What time would you like to leave? Sentence14: There are many colleges and museums but I think you will really enjoy the entertainment called whale of a time. Would you like more information? Sentence15: How about something serving British food? Sentence16: We have more than 100 restaurants all over town. May I ask if you have a certain price range you prefer to stay within? Sentence17: Yes, I in am interested in an expensive restaurant. Thanks! Sentence18: Unfortunately I cannot book the restaurant for you without a day and time. Can you provide that for me please? Sentence19: I have 6 different places that serve British food. They are spread out throughout town. Did you have an area you prefer? Sentence20: Graffiti is a great restaurant in the west area. Would you like me to make reservations for you? Sentence21: Your reference number is 73H253CP . They will hold the table for 15-minutes. How else may I help you? Sentence22: Hi, I am traveling to Cambridge and am excited to see some local tourist attractions. I really need help with a restaurant though. Sentence23: I want to leave the attraction by 7:15. Sentence24: How about Tuesday at 7:30? Sentence25: What day do you wish to dine, at what time and how many people will there be? Sentence26: There are over a dozen different attractions in the west; do you have a particular type of activity in mind? Sentence27: Yes I need an attraction in the same area. Sentence28: Thank you. I am looking for a taxi to commute between the two places. Question: Who has spoken the sentence 13? (A) User (B) System

Output: Answer: (B) System

Input: Consider Input: Sentence1: Yes, after 8:30 would be best. Sentence2: I have booked you a train ride on TR6488 which will depart at 09:21 and will arrive at 10:10. The total fee will be 10:24GBP. Would you like the reference number? Sentence3: No thank you. Thanks for your help. Sentence4: Great, thank you. That's all I needed. Sentence5: What is the total travel time? Sentence6: The post code is cb21ab and the phone number is 01223323737. Where would you like to book a train to? Sentence7: Where are you departing from? Sentence8: I would like the post code and phone number for the restaurant please, and I would like to book a train. Sentence9: The total travel time will be 49 minutes. Sentence10: You're welcome. Is there anything else I can do for you today? Sentence11: I'm leaving from Cambridge. Sentence12: I think something cheap. If not, go up to moderate. Sentence13: Do you have a time in mind? Sentence14: Good day to you. Sentence15: I suggest pizza hut city centre, it has a cheap price range. Would you like me to book it or would you like more information? Sentence16: Yes, Please book the reservation. Sentence17: I need to go to Stevenage on Sunday. Sentence18: I'd be happy to book a table for you. Please let me know the day, time, and the number of people in your party. Sentence19: There are nine of them. What price range do you prefer? Sentence20: I am looking for an Italian restaurant located in the centre of Cambridge. Question: Who has spoken the sentence 15? (A) User (B) System

Output: Answer: (B) System

Input: Consider Input: Sentence1: cheap, but i still need free wifi. Sentence2: That was all I needed today, thank you very much. Sentence3: I would suggest the alexander bed and breakfast, it has a 4 star rating, free parking and internet and it is in the cheap price range. Would you like a reservation? Sentence4: Yes, that is correct Sentence5: There are 9 that meet those requirements, was there an area you wanted to stay in? Sentence6: Okay, the booking was successful. Your reference number is M3UVOLVXD . The total fee of 226.8 GBP is payable at the station. Sentence7: Tuesday please. Thanks Sentence8: We have 35 trains taking that route, what day of the week will you need that? Sentence9: What day would you like that on? Sentence10: TR8632 leaves at 19:09. Want to book it? Sentence11: I would like to leave on tuesday. Sentence12: I need to catch a train that departs from Leicester after 18:30. Sentence13: Thank you for using our service today. Sentence14: Okay. Your booking was successful. The reference number is W7DGP5W4 . Can I help with anything else today? Sentence15: What's the best one of those options? I need it for 4 nights. Sentence16: Just to be certain, book 6 train tickets to cambridge from Leicester on tuesday at 19:09, correct? Sentence17: Thanks! I'm also looking for a place to stay that's a guesthouse. Sentence18: Yes, please. I'll need a booking for 6 and the reference number. Sentence19: What price range would you like? Sentence20: Yes please. For 5 nights for the same group of people. Question: Who has spoken the sentence 18? (A) User (B) System
Output: Answer: (A) User