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

Sentence1: You're welcome. Is there anything else I can help you with? Sentence2: I am looking for a 3 star hotel to stay in. Sentence3: Thank you. What's the travel time? Sentence4: No, that is all I need. Thanks! Sentence5: I reserved Wednesday night at the University Arms Hotel for 5 people. Your reference number is GM90EY8A . Is there anything else? Sentence6: travel time is 47 minutes Sentence7: Lets try just booking it for one night. Sentence8: The hotel should be in the expensive price range. Sentence9: Okay, I've got two that fit the bill. One in the centre of town and one in the south. Do you have a preference? Sentence10: I am very sorry, but I was unable to book a reservation for you. Would you be willing to book a later day or would you be willing to have a shorter stay? Sentence11: I do, yes. I would like to stay in the center of town. I need it to fit five people, for 3 nights, starting Wednesday afternoon. Sentence12: Great! I will need 5 tickets. Sentence13: same day as my hotel booking. Sentence14: You are booked for Train Tr5556, your reference number is JA6WAOJC . Sentence15: I do have a four star hotel in the centre of town, but it is also unable to accommodate your guests for 3 days. Can you adjust your length of stay? Sentence16: Sure I will be able to book you a train, on what particular day will you want to travel? Sentence17: Can we book the other expensive 3 star hotel for one night starting on wednesday? Sentence18: I apologize. One night is not working either. There are guesthouses. Sentence19: How many tickets do you need? Sentence20: There are 6, 3 start hotels in Cambridge. Do you have a preference for the part of town it is located in? Sentence21: No trouble at all, I hope you have a wonderful stay! Sentence22: What about the 4 star hotels? Sentence23: Yes, I also need a train leaving after 18:30 from kings lynn to cambridge. Sentence24: Thank you very much. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: I would prefer the north please. Sentence2: I have found 13 of them. Can you please be more specific about what you would like? Sentence3: I'd like to find a college to visit in the center of town. Sentence4: No thank you that will be all Sentence5: I would suggest the acorn guest house it is a great place to stay. Sentence6: That will be fine. I'll need to book for Saturday, 3 nights, and 1 person. Sentence7: You're all set! Your reference number is 41BK9PC7 . Sentence8: moderate price range thank you Sentence9: There are 32 hotels that offer free internet, is there a price range or area you prefer? Sentence10: Actually one more thin, I need a taxi from the hotel to the restaurant, I want to leave at 09:45. Sentence11: Thank you! Can you also help me find a place to stay with free wifi? Sentence12: I narrowed it down to 17. What part of town would you prefer and do you want free parking? Sentence13: No that will be it for today. Sentence14: I recommend Emmanuel college. Their address is saint andrew's street Sentence15: Okay, I booked a yellow honda and their contact number is 07225232221. Do you need help with anything else? Sentence16: You can choose one for me and give me the address. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System

Sentence1: What time would you like? Sentence2: Unfortunately, after trying to book again I was still unsuccessful. Would you like to try another day or time? Sentence3: Could you please try 18:00 on the same day? Sentence4: There are 202 trains to cambridge on Saturday. Can you tell me your departure station and the time you'd like to travel? Sentence5: I'd like the table for 19:00, please. Sentence6: Great, all I need is the reference number please. Sentence7: I would like to make a reservation for 6 people on Saturday. Sentence8: I would like to leave from stansted airport after 15:00 Sentence9: I would maybe be interested in booking this train. What is the train id, price per ticket and arrival time? Sentence10: can you book me a train to Cambridge that leaves on Saturday. Sentence11: I unfortunately do not have this info for you. The booking is now saying unsuccessful. Sentence12: That is all. Thank you. Sentence13: Okay. I have made a reservation for Saturday at 19:00 for six people. Sentence14: Can you try again please? Sentence15: Have a great day. Sentence16: Okay thanks, I also need info for the cow pizza kitchen and bar. Sentence17: Your booking for Saturday at 18:00 was made. Your reference number is L7W1NACD . May I help you with anything else today? Sentence18: The train is TR1493 with the price 8.08 pounds. The arrival time is 15:52. Sentence19: I found nine trains leaving stansted airport for cambridge, leaving every hour starting at 15:24. Would you like to book that first train? Sentence20: Ok. That's a moderately-priced gastropub in the centre. Would you like the address or phone number? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User