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

Sentence1: Sure, that post code is cb39al. Can I further assist you? Sentence2: I'm interested in visiting colleges while in town, can you please recommend some? Sentence3: I can recommend clare hall and christ's college. You need phone numbers for either one? Sentence4: Okay the TR5009 leaves at 18:40. Sentence5: Yes I also need a train to stansted airport on sunday Sentence6: That sounds great, do I call to book a seat or can you help me? Sentence7: No, thanks. That's all I needed. Sentence8: I'm glad I was able to help you. Thanks for using our service have a nice day. Sentence9: Sure. Where will you be departing from, and what time? Sentence10: Please book for 6 people. Sentence11: I am leaving from Cambridge. I would like to leave sometime after 18:00. Sentence12: I would like the post code for clare hall please. Sentence13: I would be more than happy to help you book! Tickets are 8.08 pounds. How many tickets would you like me to book for your trip? Sentence14: Booking was successful, the fee is 48.48 GBP payable at the station . Reference number is 4ESBHTB0 . Is there anything else I can help you with? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System

Sentence1: There are 33 entries for expensive restaurants in the centre. Would you like to hear some options? Sentence2: As far as thai food goes, I happen to have one place. Good thing is they are very highly recommended. It is called Bangkok City. Would you like a reservation? Sentence3: Hello, I am looking for a restaurant. The restaurant should be in the centre and should serve modern eclectic food. Sentence4: Cambridge Contemporary Art is very nice. It's in the centre part of town, like the restaurant, and it's free to get in. Can I help you with anything else? Sentence5: No, that is all. Goodbye. Sentence6: Fantastic, can you also find me a museum attraction? Sentence7: Any type would be fine I just need to know the area and entrance fee of one you would recommend. Sentence8: Can you try booking at 15:45? Sentence9: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 1NY7QJKY . Sentence10: Are any of them modern eclectic food? Sentence11: Yes, I'd like to book for 2 people at 16:45 on tuesday. Sentence12: Okay. Have a lovely day then. Sentence13: Dang...How about some Thai food instead Sentence14: There are several wonderful museums in town. Is there a specific area you prefer? Sentence15: Are there any other expensive restaurants in that area that may be nice to visit? Sentence16: There are no restaurants in that are would you like to try a different area? Sentence17: No, there doesn't seem to be any modern eclectic places at all. Would you like a different type of cuisine? Sentence18: I'm sorry, but they seem to be all booked up at that time. Would you like to try a different day or time? Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System

Sentence1: It doesn't really matter. What's your recommendation? Sentence2: There are 44 attractions in the centre of town. What kind of attraction do you want to visit? Sentence3: The post code is CB21SU. Do you need anything else? Sentence4: Cambridge Contemporary Art, what's their post code? Sentence5: I want to find some good places to go in the centre of town. Sentence6: Thank you for your help! Sentence7: Holy Trinity Church is popular for its architecture. Christ's College finds people touring the campus. Or, Cambridge Contemporary Art is a free museum. Any of those interest you? Sentence8: My pleasure! Have a good day! Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User