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

[Q]: Sentence1: They are all moderately priced, but Avalon has free internet and four stars. Would that suit you? Sentence2: Yes, free wifi. No free parking though. Sentence3: That sounds good. Do they have wifi? Sentence4: Your table has been booked. The reference number is 3FOO64PM . Sentence5: Thank you I am also looking for a restaurant in the same area as the hotel serving expensive chinese food. Sentence6: please contact us again in the future. goodbye. Sentence7: There is Hakka located at Milton Road Chesterton would you like me to reserve it for you? Sentence8: I have three guesthouses to choose from. Do you mind they are in the north? Sentence9: I'm looking for a guesthouse to stay in and I don't need a free parking. Sentence10: 01223315702 and cb12dp. Sentence11: Perfect thats all I needed! Sentence12: This one is in the north a and b guest house Sentence13: Are there any moderately priced 3 star guesthouses in the west available? If not in the west, what about the north? Sentence14: Yes please. I need it for 8 people on Wednesday at 19:15. Sentence15: That's fine. Could I get their postcode and phone number? Sentence16: No that is okay, can you book the cheapest one for me please? Question: Who has spoken the sentence 2? (A) User (B) System
[A]: Answer: (A) User

[Q]: Sentence1: What area would you like to stay in? Sentence2: I need it for 7 people. 5 nights starting Sunday. Sentence3: Which of the 2 hotels should I book for you? Sentence4: Are there any amenities that you are looking for? Parking? Internet? Sentence5: TR2021 is leaving at 20:24 would that work for you? Sentence6: I don't really have a preference for area. But I would like it to be a hotel rather than a guesthouse. And I would love free parking. Sentence7: I'd like free parking. Sentence8: How about the Ashley Hotel? Sentence9: Booking was successful, the total fee is 56.56 GBP payable at the station . Reference number is : EZIAXWCQ . Can I help you with anything else? Sentence10: Great! I'm glad I could be of help. Have a good day. Sentence11: We have ashley hotel and lovell lodge, shall I book you for one of the two? Sentence12: I am also looking for a train departing from stansted airport going to cambridge on sunday. I need to leave after 19:30. Sentence13: I'm looking for a place to stay in Cambridge, moderate price for a hotel. Sentence14: Yes, please make a booking for my group. We'll all be traveling together. Sentence15: Thank you that is all I needed today. Sentence16: Booking was successful. Reference number is L1S8JNAC . Do you need anything else? Question: Who has spoken the sentence 4? (A) User (B) System
[A]: Answer: (A) User

[Q]: Sentence1: No, I don't have a preference. I'd just like it to be expensive, please? Sentence2: i will go with the first. book for the same group of people and 2 nights starting from the same day Sentence3: Chiquito Restaurant Bar is very good. Would you like a table? Sentence4: Okay I am glad I could be of help. Thank you for calling. Sentence5: Yes. Shall I book it? Sentence6: Thanks have a nice day. Sentence7: Is that in the south area of town? Sentence8: I've made those reservations and your reference number are OZZGLCVB . Sentence9: Yes, could you please book me a table for 5 at 14:30 on Friday? Sentence10: i have 2 places. the huntingdon marriott hotel and the university arms hotel. which would you like? Sentence11: There are 3 places available. Do you have an area in mind? Sentence12: Hey, wait, just a second! I just remembered, I need a place to stay with 4 stars, preferably a hotel. Sentence13: Booking was successful. Reference number is : Y79YGBO7 . Anything else I can help with? Sentence14: Thanks, you too. Sentence15: Thank you. That's all I need today! Sentence16: I'm looking for a Mexican restaurant with expensive food. Question: Who has spoken the sentence 15? (A) User (B) System
[A]:
Answer: (B) System