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

Sentence1: You have been very helpful. Thank you. goodbye. Sentence2: Yes I certainly can! Your reservation was successful and your booking reference is 5F3KBH78 . Sentence3: Can you make reservations for 6 at 14:30 on Thursday? Sentence4: The J restaurant serves cheap asian oriental food in the centre of town. Their phone number is 01223307581. The address is 86 Regent Street City Centre. Sentence5: Can you tell me about the J Restaurant? Sentence6: Glad to help. Have a great day and enjoy your meal. Good bye. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

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: ok, what's their address and postcode? Sentence2: I also need a taxi. Sentence3: How about the avalon? Sentence4: excellent, have a great day! Sentence5: Camboats address is The Plough, Green End, Fen Ditton and their postcode is cb58sx. Sentence6: Great, if they can book for 6 people for 5 nights, starting on Wednesday. Can you try that for me? Sentence7: That would be just fine, thank you. Sentence8: I want to leave by 15:30. Sentence9: I'd be happy to help with your request, first I'll need to know your departure site and destination and what time you're looking for. Sentence10: If you're going to the east, I recommend taking a boat ride with Camboats. Sentence11: It will be a blue Tesla. You may contact them at 07008080625. Sentence12: Any area will do. Recommend something. Sentence13: All the moderately priced, 4-star accommodations are guesthouses. Is that OK? Sentence14: Which are would you like? Sentence15: I need to know a departure and/or arrival time. Sentence16: Thank you! Are there any places to go in the east? Sentence17: Thank you very much. That is all that I need. Sentence18: Can I get the contact number and the car type please? Sentence19: What is the cost? Sentence20: I was able to complete that booking for you. Your confirmation number is O4E7TJ08 . Sentence21: I will want to go between the attraction, and the hotel. Sentence22: I am looking for a moderately priced 4 star hotel. Question: Who has spoken the sentence 20? (A) User (B) System

Answer: (A) User