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

[EX Q]: Sentence1: Thank you for your help. Sentence2: do you have one with a star of 4? Sentence3: You're welcome, and have a great day. Sentence4: yes please tyhat you for all your help Sentence5: OK, you have 7 tickets reserved on TR6939. Total due at the station will be 116.2GBP. Your reference number is OK7WYTNQ . Sentence6: Try either one of the cheap ones, I need one that can hold my group of 7 for 5 nights on tuesday. Sentence7: Yes, I'll need 7 tickets. Sentence8: I also need a place to stay. 2 star is my preference. Sentence9: I would like to arrive in Cambridge by 08:45. Sentence10: We have 10 different trains on that day. Do you prefer a particular time? Sentence11: No, thank you. That will be all. Sentence12: TR6939 is your best option. It will leave at 05:39 and arrive at 07:07. Would you like to book passage on that train? Sentence13: In the west part of town. The price doesn't matter. Sentence14: the cambridge belfry was the best match for a large group so I booked you there, the reference number is X33MYBK5 , may I assist with anything else? Sentence15: Have a great time. Sentence16: I do. We have three options. Two that are cheap and one that's expensive. Do you have a preference? Sentence17: I need help finding a train. Can you do that? Sentence18: I don't have any 2 star hotels in that area. Would you like a different area or a higher rated hotel? Sentence19: Okay, do you need a reference number? Sentence20: Of course. Where are you traveling to? Sentence21: I would like to leave Liverpool street on Tuesday and arrive in Cambridge. Sentence22: okay, what area and price range? Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Yes, please. For 5 people at 14:00 on monday. Sentence2: The camboats are located in the east, how's that? Sentence3: I do not have information on the fee. Sentence4: Ok, thank you. I'm also looking for a restaurant called don pasquale pizzeria. Sentence5: Your booking was successful with reference number 1RF57JD7 . Oh, by the way, your table will be reserved for 15 minutes. Enjoy! Sentence6: Have a lovely stay in Cambridge! Sentence7: Thank you for the reference number. Goodbye! Sentence8: That might be good. What is the entrance fee? Sentence9: Don Pasquale is in the centre. Would you like me to make a reservation? Sentence10: I'm looking for some boats in the East, actually. Question: Who has spoken the sentence 7? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: No, thank you. I am not ready to reserve quite yet. Could you just tell me the postcode for The Alexander Bed and Breakfast? Sentence2: No, that should do it, thanks! Sentence3: Is it also in the cheap price range? Does it include free wifi? Sentence4: We're happy to be of service. Enjoy your stay in Cambridge! Sentence5: Yes, thank you. Sentence6: I have 9 entries meeting all 3 requirements, are you looking for a certain part of the city? Sentence7: I want to go to Kings Lynn on Wednesday. Sentence8: Sure. The Alexander bed and breakfast is in the centre, and their phone number is 01223525725. Should I book you a room? Sentence9: Actually I would just like the postcode and telephone number. Sentence10: Ok great I will book you a room for 4 people. How many nights would you like? Sentence11: Yes that sounds perfect, I will need 3 tickets and a reference number please. Sentence12: I have train TR2182 departing Wednesday at 22:11 and arriving in Kings Lynn at 22:58. Would that work for you? Sentence13: I was able to book you 3 tickets for that train. Your reference number is NYP3RNM4 . Is there anything else I can help you with? Sentence14: Hi. I need a train leaving from Cambridge anytime after 21:30. Sentence15: No - could you please choose one for me? I don't like to stress out too much about travel arrangements. Sentence16: I will need some more information to book a room, what day will you arrive, for how many people and how many nights? Sentence17: I am also looking for a place to stay, preferably a guesthouse that includes free parking. Sentence18: I will be arriving Wednesday. We will need a room for 4 people. Sentence19: Where do you want to go? Sentence20: The postcode is cb12de. Is there anything else I can help you with? Sentence21: You will have to contact the hotel directly to do that, do you still want to book the room? Sentence22: Sure. The postcode is cb12de and the phone number is 01223525725. Is there anything else I can help you with today? Sentence23: Ok. I am trying to book the hotel for 4 people for 1 night. You wanted the hotel for Wednesday night, right? Sentence24: Let's just do one night for now. Can I cancel the reservation if I decide I don't need it? Sentence25: I would like to book the room and get the reference number please. Sentence26: There are 21 guesthouses that offer free parking, did you have any other requirements? Question: Who has spoken the sentence 13? (A) User (B) System
[EX A]:
Answer: (B) System