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

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: I am also looking for Cambridge Contemporary Art. Sentence2: Can you give me their entrance fee and phone number? Sentence3: Maybe. What is the star rating and price range on that hotel? Sentence4: Are there any available rooms in the Autumn House? Sentence5: You're welcome. Enjoy your stay. Sentence6: You are all set. Your taxi would be a red lexus and you can contact them at 07614169632. Is there anything else I can help? Sentence7: no problem. Their phone number is 01223324222 and the entrance fee is free. Sentence8: Sure, I have found it for you. Is there anything you want to know about? Sentence9: That's all i need. Thank you so much for the help! Sentence10: Autumn house has a guesthouse. When are you looking to stay? Sentence11: it has four stars and its cheap Sentence12: Awesome. Can you also help me to book a taxi from the hotel to the attraction? I want to leave the hotel by 24:45. Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System

Sentence1: Thank you for the help, that's all I need. Sentence2: Unfortunately there are none on the north side of town that fit your criteria. Would you like me to look in another part of the city? Sentence3: I have Ashley Hotel or Lovell Lodge on the North side of town. They both have free wifi and parking. Can I book one of those for you? Sentence4: No thank you. Sentence5: Do either of those have 4 star ratings? Sentence6: You're welcome. Have a nice stay! Sentence7: Kirkwood house is a moderately priced hotel and its address is 172 chesterton road, cb41da. Sentence8: What is Kirkwood House's address, postcode, and price range? Sentence9: I have 5 hotels that meet your needs 2 are moderately priced and 3 are expensive. Do you have a preference? Sentence10: Is there any with a 4 star rating and includes free wifi? Sentence11: No, I'm sorry. There are several guesthouses with 4 stars. Kirkwood House is in the north and has fee parking and WiFi. Can I reserve a room? Sentence12: A hotel in the north with free parking, please. Question: Who has spoken the sentence 6? (A) User (B) System

Answer: (A) User