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

[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
[A]: Answer: (B) System


[Q]: Sentence1: You're welcome. Can I help you with anything else? Sentence2: That is all. Thanks Sentence3: The post code is CB11JG. Sentence4: Thank you, what's the post code? Sentence5: Thank you for your help Sentence6: Cambridge, parkside police telephone number 01223358966. Sentence7: I need to get to the nearest police station, can you assist me? Sentence8: Okay. Have a good day and thanks for using our system. Question: Who has spoken the sentence 4? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: Thank you. Goodbye. Sentence2: I also need to find a train from ely to cambridge. Sentence3: Is the travellers rest restaurant still open? Sentence4: I will be traveling on Sunday. Sentence5: lad we could help, call back soon! Sentence6: I'd like to arrive by 08:15. Please select the first option that comes up and book for 6 people, then send me the reference number Sentence7: Alright I have 10 trains. Please tell me when you want to leave or arrive Sentence8: Thank you for using our services. Have a great day! Sentence9: The booking was successful and your reference number is CKRJK7NI . Sentence10: Let me narrow down the choices. What day will you be traveling? And, what time do you want to arrive or depart? Sentence11: Can I book a table for six people on Sunday? At 12:15? Sentence12: It appears that they are open, but their number is 01223276182 to verify. Does that help? Sentence13: That is all I needed, thank you! Sentence14: Reference number is : 7WXPZ42X . Anything else? Question: Who has spoken the sentence 13? (A) User (B) System
[A]:
Answer: (B) System