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

[Q]: Sentence1: Your booking was successful! Your reference number is EV4ADBI9 . Sentence2: I need it for Sunday. Sentence3: Yes. Let's book it. Sentence4: I would like it to be in the west. It doesn't matter if it has free parking or not. Thank you! Sentence5: There are four three star guest houses. Is there an area of town that interests you the most? Sentence6: Train TR3154 leaves cambridge at 13:06 and will arrive at peterborough at 13:56 on Monday. Would you like me to book a ticket? Sentence7: I am looking to stay at a guesthouse that has a 3 star rating. Sentence8: ok for how long and how many people please Sentence9: I want a train that goes to peterborough and leaves after 13:00 Sentence10: Does it leave on Monday? Sentence11: There is the hobsons house. Would you like me to book it? Sentence12: For 3 days and 2 people,I need a confirmation number too Sentence13: and what day do you need the reservation for? Sentence14: The next train is the TR0545 leaving cambridge at 13:06. Would you like me to book it or more information? Question: Who has spoken the sentence 12? (A) User (B) System
[A]: Answer: (A) User


[Q]: Sentence1: Does it have four stars? Sentence2: Not yet, but can you tell me what time the train arrives in Ely please? Sentence3: acorn guest house is located in 154 chesterton road should i book it for you? Sentence4: I would like to leave on Tuesday after 18:00. Sentence5: It arrives by 20:07! Anything else love? Sentence6: TR5511 leaves Cambridge for Ely at 20.07. Do you need tickets? Sentence7: I've booked your stay at the Acorn Guest House, and your reference number is IT07BRTC . Sentence8: The trip will last 17 minutes. Is there anything else you would like to know? Sentence9: Do you know what day or time you want to leave? Sentence10: Thank you for using Cambridge TownInfo centre. Please consider us for your future travel needs. Sentence11: I need some lodging accommodations. It needs to have free parking and Internet please! Sentence12: I would like someone to book me a place with free parking and internet. Sentence13: That should do it. Thanks so much for your help! Sentence14: I found 29 hotels matching your request. What price range and area of town would you prefer? Sentence15: Thanks a lot. Can you also help me find a train going to Ely? Sentence16: Yes. Please book it for 2 people for 4 nights starting Friday. Sentence17: Yes it does. Shall I book? Sentence18: What is the total travel time on that time? Question: Who has spoken the sentence 15? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: There are no Irish restaurants in the cheap price range. Would you like something else? Sentence2: I am looking for Irish food that is cheap. I will need their phone number too. Sentence3: How about Vietnamese food? Sentence4: The only restaurant meeting your criteria is Thanh Binh in the west. Their phone number is 01223 362456. Question: Who has spoken the sentence 3? (A) User (B) System
[A]:
Answer: (B) System