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

[EX Q]: Sentence1: It does not matter, I just need one available for 7 people at 18:15 on thursday Sentence2: I'm sorry, nothing is coming up for that particular type of restaurant. Is there any other specifics you may like? Sentence3: The reference number is DVDLH9NK . Is there anything else I can help you with? Sentence4: Unfortunately I could not find any guesthouses meeting those requirements. Sentence5: How many stars is Cityroomz? Sentence6: Before I can book your taxi, what time are you wanting to leave or arrive by? Sentence7: Fantastic. Enjoy your trip! Sentence8: Not yet. I would like you to book a taxi for me between my hotel and restaurant. I will need the car type and contact number. Sentence9: It has a zero star rating, is this ok? Sentence10: I also need the reference number please. Sentence11: I just want to be sure it arrives by the booked time at the restaurant. Sentence12: Cityroomz is the only place that matches your criteria. Sentence13: That is fine. Do they have internet? Sentence14: I have made a reservation at restaurant alimentum for you. Your table will be reserved for 15 minutes. The address is 152 - 154 Hills Road. Sentence15: How about one that serves modern european food? Sentence16: Thank you very much for your help! That was everything I needed. Sentence17: How about a hotel type? Sentence18: There are 3 restaurants serving modern european food, would you prefer one on the south side or town centre? Sentence19: Yes, Cityroomz has internet. Would you like to book it? Sentence20: Booked. Your car type is white skoda and contact number is 07075801794 Sentence21: Can you find me restaurant with moderate prices that serves north indian cuisine? Sentence22: Yes, I also need a guesthouse hotel with moderate prices in the centre. I don't need free parking. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I'd like to find some place to go on the east side of town. Sentence2: Thank you. Have a good day, goodbye. Sentence3: I can certainly suggest something for you. I have 10 options. Do you prefer an entertainment venue, or perhaps a museum or park, etc? Sentence4: Sounds great. That's all I needed. Thank you! Sentence5: I would prefer just anything in the east, can you give me the address and attraction type of one? Sentence6: No problem. How does the Funky Fun House sound? It is standard entertainment and it is located at 8 mercers row, mercers row industrial estate. Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Your tickets are booked. The reference number is XVS0713S . Can I do anything else for you? Sentence2: There are two trains to choose from, one departing at 05:35 and the other 07:35, do you have a preference? Sentence3: Great I was able to get your table, reference number is 41SZJZMV . Make sure you arrive on time they will only hold the table for 15 minutes. Sentence4: I would like a reservation for 3 people please. I would like a reference number. Sentence5: Nope, thanks for your help. Goodbye. Sentence6: Sure! The fare is 4.40 GBP per person, and it's a short, 17-minute ride. Sentence7: What time would you like to make the reservation for? Sentence8: 15:00 on thursday, please. Sentence9: I certainly can. How many tickets would you like? Sentence10: Perfect! I hope that you enjoy your travels and please feel free to contact us again if you need anything. Goodbye! Sentence11: Can you book it for me? Sentence12: Yeah can you book me a table for 3 on Thursday? Sentence13: Wonderful! That restaurant is located at Market Hill City Centre, and the telephone number is 01223352607. Can I help you with anything else? Sentence14: ok i am also looking for a train on the same day as the sestaurant booking and should arrive by 09:15 should go to cambridge and depart from ely Sentence15: Can I get the price and travel time for the 7:35 departure? Sentence16: Need a certain restaurant called stazione restaurant and coffee bar. Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]:
Answer: (A) User