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

Sentence1: I'm looking for an expensive restaurant in the center of town. Sentence2: Certainly. When would you like your taxi to depart? Sentence3: Is there any Turkish cuisine? If so I need the postcode and the address. Sentence4: No, that will be all, thank you! Sentence5: I need to arrive at Cambridge Contemporary Art by 19:15 please. Sentence6: Okay, have a nice day. Sentence7: I don't really care, what do you recommend? I will need the postcode and entrance fee please. Sentence8: I am also looking for museums in the area. Sentence9: How about Cambridge Contemporary Art? The entrance is free and the postcode is cb21su. Enjoy! Sentence10: There are many museums listed in the centre area, what kind of museum are you interested in? Sentence11: No problem. Your taxi has been reserved. Your driver's contact number is 07035811281 and will be driving a grey toyota. Is there anything else you need today? Sentence12: Thank you. I would also like a taxi to commute between the two places. Sentence13: There are many expensive restaurants in the centre of town, is there a specific type of food you would like? Sentence14: The Meze Bar restaurant matches your tastes. It is located at 196 Mill Road City Centre. The postcode is cb13nf. Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User

Sentence1: I sure can. What type of place are you looking for? Sentence2: I'm looking for a place to stay, can you help me out? Sentence3: I'm looking for a guesthouse that's moderately priced. Sentence4: Please provide me with attraction type preference that you may have so that I can narrow down to a few choices. Sentence5: There are 11 options which fit your requirements. What part of town do you prefer? Sentence6: Thank you very much. I think that is all the information I need today! Sentence7: Perfect I have you booked at the Avalon for 5 nights and 5 people, the reference number is I3B3EKYI . Is there anything else I can help you with? Sentence8: Preferably in the centre. Would like a reservation for 5 people, for 5 nights beginning Wednesday. Also looking for places to go in the centre as well. Sentence9: Sure, let us try the North. Sentence10: I need it in the centre and you can make a suggestion. Sentence11: I would either recommend Avalon or Limehouse. Both are great guesthouses. Which of those would you like me to book for you? Sentence12: Please give me their phone number and postcode Sentence13: Do you have a specific area or attraction type in mind? Sentence14: I would like to be in the centre, please provide me with an entrance fee, a phone number and post code. Sentence15: There are no places to stay in Centre matching your request. Would you like to try another part of town? Sentence16: Something moderately priced, but a 4 star accommodation. And I would like free wifi too please. Sentence17: I'm also looking for places to go around town Sentence18: You are welcome. Enjoy your trip. Goodbye Sentence19: Let's go with the Avalon. Could you make it for 5 people for 5 nights? We want to arrive Wednesday. Sentence20: Ruskin gallery is a museum in the centre of town and very popular. The entreance is free. Sentence21: That's great information, but so many options! Is there a part of town that you would like to stay or other amenities you would like to have while in town? Sentence22: The phone number is 01245493131 and post code is cb11pt. Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User

Sentence1: I need the postcode please. Sentence2: That should be all the info I need, thank you! Sentence3: Sure, cambridge and county folk museum at 2-3 castle street has the entrance fee of 3.50 pounds. The phone number is 01223355159. Sentence4: Great that should work can I get the price, and departure time of that? Sentence5: What day will you be departing? Trains depart starting at 5:17 then at each odd hour. Trains arrive the next hour :08. Sentence6: Sure, the postcode for the cambridge and county folk museum is cb30aq. Sentence7: What postcode are you requesting? Sentence8: I need a train from london kings cross to cambridge. Sentence9: There are 5 museums, 4 of which are free and one costs 3.50 pounds. Do you know which area you would like? Sentence10: 18.88 pounds departure time 13:17. Sentence11: Is there an earlier train? Sentence12: There are 7 trains. The one that arrives closest to 19:15 is TR2952 which leaves at 17:17 and arrives at 18:08. Would you like to book this? Sentence13: On sunday. But I have to be there by 19:15. Which one works best for that? Sentence14: I don't care about the area. Can you give me the name, postcode, and phone number of the one with an entrance fee? Sentence15: Sorry. I am interested in finding a museum to attend and would need the postcode and phone number. Sentence16: Thank you for your help. Sentence17: I will also need the postcode please. Sentence18: There is TR1688 that arrives by 14:08 Sentence19: You're very welcome, enjoy your visit to Cambridge! Sentence20: You're welcome. Is that all I can help you with today? Question: Who has spoken the sentence 18? (A) User (B) System

Answer: (A) User