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

[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: No thank you. Can I have to phone number and postcode for that restaurant? Sentence2: I need a train to Kings Lynn. Sentence3: Thank you for using our service. Sentence4: The earliest train leaving after 17:00 on Friday leaves at 17:11. Would you like me to book this train for you? Sentence5: That would be TR9226 Sentence6: The phone number is 01223247877. It's located in the cb13nl postcode. Sentence7: Hmmm....how about an expensive restaurant serving gastropub food in the east? Sentence8: Thank you, goodbye. Sentence9: I am looking for a restaurant in the east that serves international food. Sentence10: No. There are two moderately priced restaurants with international cuisine in the centre of town. Would you like to hear about those? Sentence11: Book it, please. I need a single ticket. Sentence12: The the missing sock fits that criteria and is in the cheap price range. How else can I assist you? Sentence13: What day would you be wanting to travel? Sentence14: There's one restaurant that fits your requests, would you like me to book a reservation? Sentence15: Thanks again for the information! Sentence16: Have a great time. Sentence17: Have a great day as well. I think you'll love the Royal Standard. Sentence18: Thank you so much. Have a nice day! Sentence19: Friday please. From Cambridge leaving after 17:00 Sentence20: Can you give me the train ID on that one please? Sentence21: Is there one in the expensive? Sentence22: You have been booked for the train. Your reference number is 0UIC4MX9 . Can I help you with anything else? Question: Who has spoken the sentence 20? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Perfect, thanks. Could you also tell me if there are any trains from norwich to cambridge that arrive by 10:00 on friday? Sentence2: Is there anything else I can help you with today? Sentence3: Certainly, did you have a particular place in mind? Sentence4: There are four trains arriving before 10:00 on Friday. They leave norwich every hour on the :16 starting at 05:16 to 08:16 Sentence5: Well the travel time for the TR3293 that leaves at 8:01 is 79 minutes. Sentence6: old schools is in trinity lane and entrance is free. can i give you their phone number? Sentence7: Can you help me find places to go in town? Sentence8: That is all I needed have a nice day. Sentence9: An architecture attraction would be good. Sentence10: Can I have the travel time? And the train ID please. Sentence11: What area is trinity lane in? I'd love to find a train going to cambridge as well. Sentence12: Old Schools is located in the centre area of town. Is that location convenient for you? Sentence13: I'm glad I could help. If you think of anything else you need feel free to contact us any time. Sentence14: Great, thank-you! That is perfect. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]:
Answer: (A) User