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

Sentence1: Booking was successful, the total fee is 450.6 GBP payable at the station . Reference number is : G368B2VI . Can I help with anything else today? Sentence2: I would like to stay in the centre of town please. Sentence3: TR0254 Leaves at 05:40, would you like me to book that for you? Sentence4: I will be departing from Birmingham New Street on Tuesday. Sentence5: The price is 75.10 pounds and it is a 163 minutes ride. Can I help you with anything else? Sentence6: Please book 6 tickets and send me the reference number. Sentence7: No thank you. Please tell me about the ticket pricing and time of travel Sentence8: Okay, the postcode is cb11ly. What else can I help with? Sentence9: No, not yet. I just need the postcode. Sentence10: Thanks for using Cambridge TownInfo centre. Have a great day! Sentence11: I'm looking for a train that goes to Cambridge and arrives by 08:45. Sentence12: The Gonville Hotel will meet all of your needs. Would you like me to book it? Sentence13: I found two expensive hotels, one in the centre and one in the south of town. Do you have a preference? Sentence14: Again, 3 star with free wifi. I don't care about the price. It has to be in the centre, though. Sentence15: That is all, thank you for your help today. Sentence16: Yes please. I need a 3 star hotel that offers free wifi Sentence17: I found 231 trains that fit your request. Where will you be departing from? Sentence18: What price range and what star rating are you looking for ? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System

Sentence1: Alright. Enjoy your stay in Cambridge! Sentence2: Thank you. Have a great day. Sentence3: The train that arrives closest to 16:45 is best. I just need to know what time it leaves and arrives. Oh and of course it's ID. Sentence4: Yes. I am looking for a place to go in the west part of town. With preference to college. Sentence5: There are 6 days that arrive before 16:45 on this day. Did you have any other preferences? Sentence6: I am looking for information in Cambridge. I need a train ticket. Can you help? Sentence7: In the west part of town Clare College. The entrance fee is 2.50 pounds. Sentence8: Great that's all the information I need! Sentence9: Certainly. What is your departure location and your arrival location? Sentence10: It has been my pleasure. Feel free to contact us with any other questions you may have in the future. Sentence11: I would like to depart from London Liverpool Street and arrive in Cambridge. I would like to leave Sunday and arrive by 16:45? Sentence12: Of course! That will be TR6578 leaving at 13:39 and arriving at 15:07. The price is 13.28 pounds and it's an 88 minute duration. May I help with anything else? Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System

Sentence1: On Saturday, please. Sentence2: The place to go is the man on the moon. Need a phone number? Sentence3: The address is 2 norfolk street. Sentence4: i'm also trying to catch a train on saturday. Sentence5: I am still waiting on that information. Can I get the cost of the ticket and the travel time please! Sentence6: One more question: What day will you be travelling? Sentence7: No thank you! That will be all for today! Sentence8: Sorry about that, the TR2025 costs 14.32 pounds, and is a 60 minute trip. The TR9384 leaves earlier, at 8:32, and costs the same amount. Want me to book one? Sentence9: Sure, I can help you with that. What time were you wanting to leave around? Sentence10: We have trains running every hour from 08:32 to 23:32. I can get you on the TR2025 that leaves at 10:32 if you'd like. Sentence11: Which will you be leaving from ? Sentence12: I would like to leave after 8:15. Sentence13: Which stations will you be using? Sentence14: Thank you for using this system goodbye Sentence15: No thanks. I'm actually looking for an address please. Sentence16: There are many trains getting to cambridge on saturday from broxbourne. Do you have a specific time you want to be there by? Sentence17: I will be departing from Broxbourne. Sentence18: The train should leave after 08:15. Sentence19: Broxbourne and Cambridge. Sentence20: What is the price for the TR2025? And how long is the trip? Sentence21: Please Provide me with this information, as I cannot travel without it. Sentence22: I'm looking for a concerthall in the centre. Question: Who has spoken the sentence 4? (A) User (B) System

Answer: (A) User