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

[Q]: Sentence1: Booking was successful for Tuesday. Your Reference number is : 0J3V1091 . Sentence2: I'm sorry that doesn't seem to be available would you like me to try a different day or guesthouse? Sentence3: I'm sorry, there does not seem to be a historical site or hiking area in Cambridge. Is there anything else I can help with? Sentence4: Sure, I can help you with that. What section of town were you looking for? Sentence5: Doesn't really matter if they offer either of those or not. I just want it to be a 0 star hotel. Sentence6: Then the city centre north b and b is what you want, shall I book you? Sentence7: i don't really care about the area. Sentence8: I want to see local sights, can you help? Sentence9: I like hiking and seeing historical sites. Sentence10: Okay. Are you interested in hotels that offer internet and/or parking? Sentence11: Yes, I would like to find a hotel in the cheap price range? Sentence12: Yes, a guesthouse is fine. I was looking for zero stars and in the cheap price range. Sentence13: Great, thanks. I don't need anymore help. Goodbye! Sentence14: Yes, please book it for me. Sentence15: I'm sorry, I seem to be having an error in my system. You want a booking at the citycentre north B&B for 6 people, 5 nights, on Monday? Sentence16: I'm also looking for somewhere to go. Perhaps the college. Can you tell me the postcode for the college? Sentence17: City Cenrtree North and B is a cheap hotel,would you like me to book it for you ? Sentence18: Let book the same but on Tuesday instead. Sentence19: I'm happy I could help today. Goodbye! Sentence20: There are 18 colleges in town. I recommend christ's college in the centre. The postcode is cb23bu. Sentence21: Yes, there is a wide variety, do you have an activity type that your are interested in? Sentence22: Yes please, 6 people for 5 nights and we would be arriving Monday. Question: Who has spoken the sentence 21? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Wait, I might want to change my mind about that restaurant. Are there any that serve food from Corsica? Sentence2: No, there are none fitting that description, sir. Sorry about that. Sentence3: Booking was successful. The table will be reserved for 15 minutes. Reference number is : Q91F26L3 . Sentence4: Do you need any further assistance? Sentence5: Royal spice is cheap and looks great. Sentence6: I'm looking for places to eat in the North part of town. Sentence7: Thank you for using our services. Sentence8: You're more than welcome. May I do anything else for you today? Sentence9: Thanks, will you please book a table for 6 people on saturday at 12:45? Sentence10: its called city stop restaurant, serves european food and address is Cambridge City Football Club Milton Road Chesterton Sentence11: No, thank you. No further questions for now. Goodbye. Sentence12: I figured, my wife asks me odd random question sometimes, had to check. I am all set, thanks. Sentence13: I need a cheap place, please. Sentence14: Perfect! Thank you for all of your help. Sentence15: No, it is expensive. Sentence16: Is it a cheap restaurant? Question: Who has spoken the sentence 9? (A) User (B) System
[A]: Answer: (B) System


[Q]: Sentence1: Great, thanks! Also, will you please book me a taxi from the attraction to the restaurant, leaving the attraction at 05:45? Sentence2: There are 13 colleges in the centre of town. Most are free, but some do charge an entrance fee. Any preference? Sentence3: Jinling noodle bar, postcode cb23pp. Is there any more info I can give you? Sentence4: great, i have three options for you to choose from! Sentence5: No, that's it. Thank you very much. Sentence6: Do you prefer a specific type of food? Sentence7: thanks for using our services Sentence8: Oh, I have no idea. Can you just reserve tell me your favorite one? I'll need a postcode for it. Sentence9: corpus christi is popular this time of year. The address is at king's parade. The post code cb21rh and the entree fee is 2 pounds. Sentence10: You are welcome. Thank you for using Cambridge TownInfo centre. Goodbye. Sentence11: Ok, to be clear, which price range do you prefer-- cheap, moderate or expensive? Sentence12: I prefer Chinese food Sentence13: I am looking for a moderately priced restaurant Sentence14: How about choosing a famous one and give me the address, postcode and entrance fee. Sentence15: I would like to visit a college in the same area as the noodle bar, can you find me one? Sentence16: Thanks again. That was all I needed. Sentence17: I was able to book a taxi it will be a red volvo and the contact number is 07754509492. Is there anything else I can help with? Sentence18: I'm looking for a family friendly restaurant that is reasonably price and located in the center of town near attractions, hotels and easy access to transportation such as buses and taxis. Question: Who has spoken the sentence 1? (A) User (B) System
[A]:
Answer: (B) System