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

[EX Q]: Sentence1: Great. I was finally able to get you into the Autumn House staring Friday for 3 nights and 3 people. your booking reference is C5ARPTZ2 . Sentence2: Sorry about the confusion earlier. I was able to book your room at Leverton House for Friday, 3 nights for 3 people. The reference number is U5B3PHWC . Sentence3: It was my pleasure. Goodbye! Sentence4: Can you try 3 nights instead? Sentence5: Perfect. I would like to book it for 3 people for 4 nights starting on Friday. Sentence6: Awesome. Thank you for everything! Sentence7: I can help you with a taxi. Please tell me your departure and destination sites along with your time frame. Sentence8: Yes let's try a different hotel. Sentence9: How about Cambridge Contemporary Art, on 6 Trinity St? Entrance is free. Sentence10: The Leverton House is a guesthouse located on the east side of Cambridge. What information are looking for? Sentence11: Both of them are booked solid for the days you requested. Would you like a hotel in a moderate price? Sentence12: I'd like to visit a museum if possible. Sentence13: Can they accommodate 3 people for 4 nights? Also, what are their phone numbers? Sentence14: I'm sorry. I am unable to book your stay. Could you arrive on another day or stay for a shorter amount of time? Sentence15: I'm sorry, it doesn't look like the Leverton House will be able to accommodate you. How about Allenbell or Autumn House? They are in the same area and also inexpensive. Sentence16: Can you please check for 3 nights at the same hotel for 3 people and can I have the reference number? Sentence17: I'm sorry both of those hotels are booked solid. Would you consider slightly more expensive accommodations? Sentence18: Okay. I'll need a taxi too. Sentence19: I want to leave the hotel by 22:00 to go to the Museum you mentioned. Sentence20: I'm looking for places to go in the centre of town. Sentence21: I'm also going to need a taxi, please. Sentence22: Sure. But I still need to book a hotel. Is there anything else available? Sentence23: Do you have the phone number for Autumn House's front desk? Sentence24: There are many attractions in the centre of town. Could you be more specific about what you're looking for? Sentence25: I'm looking for information on the Leverton House hotel. Sentence26: Sure. It's 01223575122. Anything else? Sentence27: They don't have a room available for 3 nights either. Anything else you'd like me to try? Sentence28: A black skoda will pick up up at Leverton House at 22:00 and bring you to Cambridge Contemporary Art Museum. The contact number is 07697068185. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Booking completed! Booked car type : red ford Contact number : 07059574947 Sentence2: Thats everything I needed thanks for the help! Sentence3: I'm afraid there aren't any theatres on the west side. most of our theatres are in the city centre. is there something else I can look up for you? Sentence4: Yes, I love museums. Sentence5: Yes I also need a taxi to arrive there by 18:00 from the theater. Sentence6: I'll be here any time. Sentence7: Can you find a restaurant called Rajmahal. Sentence8: There are several museums in the area. Would that interest you? Sentence9: Great, thanks. I'm also interested in attending a theatre on the west side. Sentence10: Ok are there any attractions in the west you recommend? I need a phone number for whatever you chose. Sentence11: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 1XCDMW6O . Sentence12: In the west if there are any there? Sentence13: Sure. It's an Indian place in the east area of town. What would you like to know about it? Sentence14: What entertainment choices are in the west? Sentence15: sorry, i couldn't find anything in the west. Sentence16: That's all I need to know. Can you reserve me a table for 3 Saturday at 18:00? Sentence17: How about the Kettle's Yard, there phone # is 01223748100 and they are on Castle Street. Admission is free too. Does this work? Sentence18: What side of town would you like to be on? Question: Who has spoken the sentence 13? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: What is the price and travel time? Sentence2: There is a train leaving at 13:29 and arriving at 14:07. Would you like me to book that for you? Sentence3: I am also looking for a train. The train should depart from bishops stortford and should go to cambridge. Sentence4: We have three choices, any other preferences? Sentence5: Yes. The hotel should be 4 stars and located in the west with free parking please. Sentence6: There are 2 hotels available, The Huntingdon Marriott and the Cambridge Belfry. Do you want an expensive hotel or a cheap hotel? Sentence7: What time would you like to arrive in Cambridge? Sentence8: I will need the day you want to arrive. Sentence9: I would like it starting Thursday for 8 people for 5 nights. Sentence10: The price is 10.10 pounds, and the travel time is 38 minutes. Sentence11: On what day will you be travelling? Sentence12: Have a safe trip. Sentence13: Can I look up anything else for you? Sentence14: How many nights and for how many people? Sentence15: Hello, can you help me with my plans as far as finding a place to stay? Sentence16: I will be traveling on Thursday. Sentence17: Of course, do you need anything specific? Sentence18: Okay. Your booking at the Cambridge Belfry was successful. The reference number is LJOEY6H2 . Can I help you with anything else today? Sentence19: Arrival time isn't the issue, but I have morning meeting so I can't leave bishops stortford until after 12:15 . Sentence20: As long as it is a hotel, I would like to book it. Sentence21: I'm sorry I actually need it for Thursday, sorry. Any price range is fine. Sentence22: I will need to be there on wednesday. Sentence23: That was all I needed. Sentence24: Ok! Have a great day! Sentence25: Thank you so much. I think that's all I need now. Sentence26: Thank you for your help. Question: Who has spoken the sentence 3? (A) User (B) System
[EX A]:
Answer: (B) System