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

Sentence1: Ok great! I was able to get you booked, your reference number is N4TJE8VR . Is there anything else that I can help you with? Sentence2: Yes please. There are 5 of us total and we need 4 nights in a row. Thank you. Sentence3: May I get your departure and destination information please? Sentence4: Can you verify the cost for train TR6954 for me? Sentence5: There don't seem to be any 5-star lodgings in the city. Would you like to try searching for 4 stars instead? Sentence6: I am looking for a train arriving by 9:45 on Tuesday. Sentence7: I'd like to start my stay on Tuesday, please. Sentence8: Your booking reference is NT43PSC0 . Now, if you let me know what type of hotel you are interested in, I can help you with that as well. Sentence9: TR6954 departs from Leicester at 07:09 and arrives in Cambridge at 08:54. Would you like to book this train? Sentence10: What day would like to start your stay? Sentence11: Maybe... how much does it cost? Sentence12: Yes, 4 stars would be fine. Sentence13: Nope, that'll take care of everything, thanks! Sentence14: I am going from Cambridge to Leicester. Sentence15: I'm sorry, we have that mixed up. I need to depart from leicester and go to cambridge. Do you have a train that arrives by 09:45 in cambridge? Sentence16: The acorn guest house is a 4 star hotel located in the north side. Would you like to make reservations? Sentence17: You're welcome. Have a great stay! Sentence18: TR2863 departs from Cambridge at 07:21 and arrive in Leicester by 09:06. Would you like to book this train? Sentence19: Yes I would like help with booking the train and I will also need to book a hotel. Sentence20: It costs 37.80 pounds per ticket. Sentence21: The cost for this particular train is 37.80 pounds per ticket. Would you like assistance booking tickets for this train? Sentence22: Can you help me find a 5-star room somewhere that offers free parking and wifi? Question: Who has spoken the sentence 17? (A) User (B) System
Answer: (B) System

Sentence1: The phone number for pizza hut cherry hinton is 01223 323737 and they are located at G4 Cambridge Leisure Park Clifton Way Cherry Hinton. Sentence2: There are two restaurants: Pizza Hut Cherry Hinton and Restaurant Alimentum. Sentence3: No, there are only 2 restaurants in the area. Is there anything else I can help with? Sentence4: Give me the address and postcode of any of them, please. Sentence5: That's great. Thank you so much Sentence6: What kind of food do you want? italian or modern european? Sentence7: The postcode is C.B. 1 7 D.Y Sentence8: Is there anything else available? Sentence9: Hello, I am looking for a moderately priced restaurant in the south part of town. Sentence10: I do not care. Sentence11: What is the postcode? Sentence12: You're very welcome. Question: Who has spoken the sentence 6? (A) User (B) System
Answer: (A) User

Sentence1: No that was all I needed. Thank you so much. Sentence2: Thanks so much! Sentence3: I would like gastropub food. Sentence4: Sure, that works. What is the area, postcode and phone number for the Cow Pizza Kitchen and Bar? Sentence5: what about royal standard? it's lovely Sentence6: No, but can you tell me the address for the best one to visit? Sentence7: cambridge has a college that is in the centre. I would like to know more Sentence8: Sure! What kind of food do you want? Sentence9: Is that in the moderate price range? Sentence10: It is in the expensive range. However, the cow pizza kitchen and bar is in the moderate range. Sentence11: Thanks. Could you also help me find a place to eat? Sentence12: You're welcome, have a great day! Sentence13: Is there anything else I can help you with today? Sentence14: 01223308871 is the number and the postcoade and address is cb23qf Corn Exchange Street Sentence15: There are 13 colleges in the centre area of Cambridge. Did you have a particular one in mind? Sentence16: Sure, Christ's College is on saint andrew's street and the postcode is cb23bu. Question: Who has spoken the sentence 4? (A) User (B) System

Answer: (A) User