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

Sentence1: I'm also looking for a restaurant in the centre of town that serves chinese food. Sentence2: I need to leave bishops stortford. Do you have a train going out? Sentence3: The Ugly Duckling sounds interesting! What's their address? Sentence4: I'd like to go to Cambridge and would be leaving on Thursday after 16:30. What is available then? Sentence5: Fantastic, have a great day! Sentence6: They are 10.10 pounds each Sentence7: I have 4 choice for you. The Ugly Duckling, Tang Chinese, HK Fusion, and the Sesame Restaurant and Bar. Does one of these sound like something you would like to try? Sentence8: No thank you. That is all. Sentence9: The Ugly Duckling is located at 12 St. Johns Street City Centre. Their postcode is cb21tw. Is there anything more I can help with? Sentence10: There's a train that leaves at 17:29 and arrives by 18:07. Does that sound okay? Sentence11: I am sure I do, where would you like to go? Sentence12: Yes, that would work. What is the price of a ticket? Sentence13: There are several Chinese restaurants in the centre of town. What price rnge are you looking for? Sentence14: I prefer something expensive. Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System

Sentence1: Sorry. TR2052 departs from leicester and the destination is cambridge. It leaves at 15:09 on Wednesday. Would you like me to book it for you? Sentence2: Yes, I only need 1 ticket for myself. Sentence3: There are 13. I could recommend Trinity College on Trinity Street. Or would you like information about one of the others? Sentence4: I would like to arrive by 17:00 in leicester. Sentence5: I would like help finding a college to visit in the centre of town. Sentence6: Of course. The address is Trinity Street, postcode is CB21TQ, and the entrance fee is one pound. Can I help you with anything else? Sentence7: Yes and please give me the reference number. Sentence8: OK, I've booked one ticket for you on TR0451 from cambridge to leicester, arriving at 16:06. Ref# 8OZNJHMO . Can I help you with anything else today? Sentence9: That sounds good. Could you give me the entrance fee, phone number, and postcode? Sentence10: Certainly. Just to verify, are you traveling alone? You would only like one ticket? Sentence11: TR3702 LEAVES AT 05:00 CAN I BOOK THAT ONE FOR YOU? Sentence12: How early do you wish to arrive? There are 11 trains that will get you there before 17:00. Sentence13: Thank you for using our service. Have a good night. Goodbye. Sentence14: Does this train go to Leicester from Cambridge? Sentence15: Yes I'm also looking for a train that leaves wednesday and arrives by 17:00. Sentence16: I think that is all I need, thank you. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: Thank you and enjoy your visit. Have a great day. Sentence2: What time did you book the taxi to pick me up at the museum? Sentence3: I'll do that. Could you please tell me once more the contact number and the car type? Sentence4: Please have a nice day. Sentence5: I have you booked at charlie chan on thursday at 14:00 here is your Reference number is : E41S2AFE . Sentence6: It's address is at sidgwick avenue and it is free to enter. Would you like their phone number as well? Sentence7: I don't mind what time we leave, but I need to arrive at the restaurant by 14:00. Sentence8: The west part of town? Sure, give me more info about it? Sentence9: Can I please also book a taxi between the museum and the restaurant? Sentence10: They did not mention what time that would be, only that you'd be arriving at the restaurant by 14:00. Perhaps you can give them a ring at that contact number? Sentence11: When would you like the leave and arrive by? Sentence12: Yes, please. I need it for 8 people at 14:00 Thursday and a reference number. Sentence13: That is all. Thank you. Sentence14: There aren't any cheap Chinese restaurants nearby but there are 4 in town. Would you be interested in any of those? Sentence15: I've heard of your Museum of Classical Archaeology, and I'd like to know more about it. Sentence16: I have that booked for you at Charlie Chan's in the centre of town. Reference number E41S2AFE Sentence17: The Museum of Classical Archaeology is in the west part of town. Would you like the address or phone number? Sentence18: The car type is a black skoda and the contact number is 07389012325. Is there anything else I can do? Sentence19: I was able to book that taxi for you. Be looking for a black Skoda. Should you need to contact them, their phone number is 07389012325. Anything else? Sentence20: No, but I need a cheap chinese restaurant nearby as well. Sentence21: I'll need a taxi to commute between the two. Sentence22: Thank you once again for your help. Question: Who has spoken the sentence 17? (A) User (B) System

Answer: (B) System