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

Sentence1: Yes, my destination is cambridge. I need to get there by 15:45. Sentence2: I have train TR2144 that departs at 14:32 and arrives by 15:32. Would that work for you? Sentence3: I would recommend architecture and there are many places to visit and see great architecture. Sentence4: Thank you and enjoy your visit to cambridge. Have a good day. Sentence5: There are museums, concert hall, cinema, and boating. What kind of attraction do you find interesting? Sentence6: Can I get the postcode, address of a great architecture place to visit please? Sentence7: Could I have the addresses and postcodes for all of them please? Sentence8: Booking was successful, the total fee is 17.89 GBP payable at the station . Reference number is : 458XMYMR . Sentence9: I would recommend old schools, located on trinity lane, post code cb21tt. Is there anything else I can help you with? Sentence10: Thanks again for all your help. Goodbye. Sentence11: Yes, I need a train. I'll be departing from broxbourne on friday. Sentence12: Thank you, that't all I needed. Sentence13: What do you recommend? Sentence14: Hi there, I'm in the centre of town and I'm bored. Can you tell me about what sorts of things to do there are around here? Sentence15: Yes I would like to book that ticket for Friday please. Sentence16: What is the price? Sentence17: It's 17.90 pounds per ticket. Would you like to book that train? Sentence18: I can give you that information once we narrow down your interest to a few locations. What type of attraction are you looking for? Sentence19: Okay, I have 19 trains leaving Broxbourne on Friday. Do you have a specific location you're wanting to go to? Sentence20: Thank you you too Question: Who has spoken the sentence 6? (A) User (B) System
Answer: (A) User