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

Example Input: 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
Example Output: Answer: (B) System

Example Input: Sentence1: How many tickets please Sentence2: I want to go to Cambridge on Wednesday. Sentence3: I can give you all kinds of information as well as book a ticket. Where are you going and when? Sentence4: Have a great stay in town. Goodbye. Sentence5: Train TR9741 arrives at 07:52 and I have booked you for 2,here is your information:Booking was successful, the total fee is 8.8 GBP payable at the station . Reference number is : U44P6DQP . Sentence6: I want you to book it for 5 nights, starting wednesday. 2 people. Sentence7: Where will you leave from? Sentence8: Sure thing, what kind of information do you need? Sentence9: Nope, that's all I need today. Thanks for all your help. Goodbye! Sentence10: Okay that booking was successful. Your reference number is 2VD26230 . Anything else I can do for you? Sentence11: I am looking for information and would appreciate the help. Can you help with a train? Sentence12: Would you like to specify a departure or arrival time? Sentence13: I would need 2 tickets. Sentence14: Can you also look up the hotel Carolina Bed and breakfast? Sentence15: I will be leaving from ely. Sentence16: I need to arrive by 08:45 Question: Who has spoken the sentence 13? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I'm looking for a place to stay. I'd prefer a guesthouse with four stars. Sentence2: We have 11 moderately priced guesthouses that are 4 stars. What area do you want to stay in? Sentence3: The same time. Sentence4: We have several 4 star guesthouses. What side of town are you looking to stay in? Any budget in mind? Sentence5: a and b guest house would meet this criteria. It is located in the east. The phone number is 01223315702. The post code is cb12dp. Will that be all? Sentence6: Yes, that's everything. Thanks for your help! Sentence7: The TR8070 train leaves Leicester for Cambridge on Saturday at 09:09. This is the most appropriate choice for your needs. Would you like me to book it? Sentence8: I have quite a few, when were you planning your stay? Sentence9: If there's nothing else I can do for you, have a great stay. Sentence10: Neither. I am looking for a train departing from Leicester and going to Cambridge that's leaving Saturday after 08:30. Sentence11: Of course, are you looking for a hotel or attraction to visit? Sentence12: Sure, I can do that. Did you want to narrow it to a specific area of town? Sentence13: I'd like a moderately priced place please. Sentence14: No thanks, I was needing the train ID but you already gave that to me. Thanks so much. Sentence15: I am looking for information in Cambridge Sentence16: Area of town doesn't matter. Sentence17: If you could recommend any one of them that would be great. I need the postcode, phone number and the area the hotel is in please. Sentence18: Thanks for using our service! Question: Who has spoken the sentence 3? (A) User (B) System
Example Output:
Answer: (B) System