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

Sentence1: Yes, see if 15:00 is available. Sentence2: I am sorry, I was unable to reserve a table for that time on Saturday, would you like to try a different time slot? Sentence3: I need a guesthouse in the cheap price range. Sentence4: Yes, I am also looking for a restaurant called The Nirala. Sentence5: Do any of these hotels have 4 stars? Sentence6: Booking was a success! Sentence7: Any area is fine, but I'd like to book rooms for 8 people. We'll be staying 5 nights, beginning on Saturday. Can any of them accommodate that? Sentence8: I have many results for a cheap guesthouse, would you like to narrow it down to stay in a particular area of the town? Sentence9: Glad that I could be of service. Goodbye! Sentence10: I'd like to book a table there for 8 at 16:00 on Saturday, please. Sentence11: I was able to get you rooms at the Alexander Bed & Breakfast. Reference number is : HREOM15W . Can I be of further assistance today? Sentence12: The nirala serves indian food in the north side of town. It is located at 7 Milton Road Chesterton, phone 01223360966. Is there anything else I can help with? Sentence13: Could you please provide the reference number? Sentence14: Great - that's all I need today. Thanks for your help! Sentence15: Sure thing. The reference number is Z1YHIR0Y . Sentence16: Yes, in fact 7 of the 9 hotels in your search criteria have 4 stars. Would you like to narrow your search by area? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

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
Answer: (A) User

Sentence1: I have many choices: theater, colleges, museums, architecture. Do any of these venues interest you? Sentence2: Christ's College offers free admission. Sentence3: What day would you be arriving on and for how many people? Sentence4: There are 7 hotels that meet that criteria. Do you have an area preference? Sentence5: Fantastic. I have all of the information I needed, thank you. Have a great day. Sentence6: Any of them will do. I'll book a room in whichever one you think is best. Sentence7: Do any of these 7 have free wifi? Sentence8: That would be fine. Can you confirm the entrance fee? Sentence9: That would be great. Two nights please. Sentence10: Yes certainly. We have several. Christ College is a good choice. Sentence11: I have 18 results that match your request. To help narrow it down, what part of town would you like to stay in? Do you have a price range preference? Sentence12: The hotel also needs to be cheap and have free wifi. Sentence13: The alexander bed and breakfast is in the center of town, would you like help with the booking? Sentence14: Let's try 5 nights, starting Friday, with 2 people. Sentence15: Yes, I am looking for something to do during my stay. I'd like it to be around the centre area. Sentence16: I have confirmed your reservation at alexander bed and breakfast starting Friday for 5 nights. Your reference number is K67RS8EB . Is there anything else I can help with? Sentence17: Glad to have been able to assist you. Thank you and have a great day. Sentence18: I am looking for a 4 star guesthouse in Cambridge. Sentence19: They all have free wifi. Sentence20: Are there any colleges in the centre of town that have free admission? Question: Who has spoken the sentence 6? (A) User (B) System
Answer: (A) User