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

[EX Q]: Sentence1: Yes, please. I need to book the train for 8 people. Sentence2: enjoy your stay in cambridge! Sentence3: TR2125 leaves a 09:01 and arrives by 10:01. Would you like a ticket? Sentence4: Thanks! I also need a train to Broxbourne on Thursday. Sentence5: I'm looking for places to go watch entertainment. Sentence6: Fantastic, thank you very much. I don't need anything further today! Sentence7: There are 5 entertainment venues in Cambridge. Do you have an area in mind? Sentence8: There are quite a few options. Do you have a preference for departure or arrival time? Sentence9: I don't mind the area. can I get the address to one of them? Sentence10: Yes I was able to book that for you and your reservation number is 648C0A9S . Sentence11: Yes, I want to depart from Cambridge any time after 8:30. Sentence12: The Funky Fun House is amazing. I think you'll love it. Their address is 8 Mercers Row, Industrial Estate. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: That would be TR5906 at 21:39 on Monday. Sentence2: The first train after 21:15 works for me. I need to book it for three people, please provide the reference number. Sentence3: Thank you so much for all your help. Sentence4: Great, have a wonderful day! Sentence5: Will you be needing anything else today? Sentence6: I am interested in cinemas specifically. Sentence7: There are 70 trains that leave from London Liverpool Street to Cambridge, what day and time would you like to leave? Sentence8: Excellent. I'd also like a train please. One that leaves from london liverpool street to cambridge. Sentence9: I can certainly book that for you! However, could you let me know what day of the week you'll be travelling? Sentence10: I'm looking for places go to in the south of town. Sentence11: No thank you. That is everything I need at this time. Sentence12: I have booked 3 tickets for you for 49.8gbp payable at the station. your reference number is ETOI91ON Sentence13: The Cineworld Cinema is in the South part of town. Their phone number is 00872208000. Would you like their address? Sentence14: I will be traveling on Monday, and I will need the reference number as well. Sentence15: Great! Thank you. What a relief. Sentence16: Yes, please give me the address and postcode. Sentence17: It's located at cambridge leisure park, clifton way and the postcode is cb17dy Sentence18: The attraction types in the south area are theatre, park, nightclub, museum, cinema, and entertainment. Which one are you interested in? Question: Who has spoken the sentence 6? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I would like the reservation at 19:30 please. Sentence2: Do they have a table available for 5 people on Wednesday night? Sentence3: Can you try a different restaurant in the same area and price range? Sentence4: I'm sure I can. We have 17 chinese restaurants. Is there an area of town you'd prefer? Sentence5: Can you help me find a Chinese restaurant please? Sentence6: A table is reserved for you at Dojo Noodle Bar. Your reference number is AEQLOL33 . Sentence7: There is an asian oriental cheap restaurants called Dojo Noodle Bar. Would you like to book there instead? Sentence8: I am sorry there are no others in any other areas,could I check another price range? Sentence9: Thank you for all your help today. Sentence10: How about the Charlie Chan restaurant? Sentence11: What about another restaurant in a different area but same price range? Sentence12: Have a lovely day. Goodbye. Sentence13: I'm sorry but I was unable to make a booking. Could we try another day or time? Sentence14: I would like to be in the centre of town, and if it could be inexpensive, that would be ideal. Sentence15: I suppose that would be all right. Sentence16: For what time please? Sentence17: No thank you I need it in that area and pricerange. Sentence18: I am sorry there are no others in the same area and price range. Question: Who has spoken the sentence 17? (A) User (B) System
[EX A]:
Answer: (B) System