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: Kymmoy is a great Asian Oriental place in the center of town, but it's expensive. Sentence2: Is there a Oriental restaurant in the City Centre that is in the expensive price range? Sentence3: I have 2 matches. Do you have a type preference? Sentence4: Thanks. I'm also wanting to see if there's someplace to get polynesian food in the centre of town. Sentence5: That's all I will need. Thank you! Sentence6: Where is it located? Sentence7: Please help me find a hotel to stay at in the centre that has a 4 star rating. Thanks! Sentence8: Thank you for using the Cambridge TownInfo centre. Please have a pleasant day. Sentence9: There are no Polynesian restaurants in the centre. Sentence10: I want an expensive place with free wifi. Sentence11: Its location is on Regent Street. Sentence12: That narrows it down to one choice, the University Arms Hotel. It meets all of your requirements, plus has parking. Would you like me to check availability? Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User

Sentence1: I have train TR7556 arriving at 18:08,is that okay? Sentence2: The restaurant should serve italian food and should be in the south. The restaurant should be in the expensive price range Sentence3: Absolutely! What type of cuisine are you interested in trying? Sentence4: Booking was successful. The table will be reserved for 15 minutes. Reference number is : UA39MMKX . You're all set. Is there anything else I can do for you? Sentence5: I will need that for eight people. Sentence6: No, thanks that's all goodbye Sentence7: Frankie and Bennys fits your criteria, shall I book you a table? Sentence8: Yes please, for the same group of people on the same day at 21:00. Sentence9: Great your booking was successful and your reference number is TESIIRJ1 . Sentence10: Thanks can you also help me find some food? Sentence11: I want to leave London Kings Cross on Monday and arrive by 18:15. Sentence12: There are many trains going to cambridge today. Where are you leaving from and what time do you want to depart or arrive? Sentence13: I need help booking a train to cambridge today. Sentence14: Thank you for calling and enjoy your dinner. Question: Who has spoken the sentence 2? (A) User (B) System
Answer: (A) User