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

Ex Input:
Sentence1: I'm also looking for a train. It should depart Cambridge after 14:15 and arrive in Norwich on friday. Sentence2: I have a 3 star hotel and a 4 star hotel both in the centre. Would you like to book one of them? Sentence3: I'm looking for a hotel to stay at. I want it to be at least 2 stars and in the center of town. Sentence4: TR8314 departs Cambridge at 14:36 and arrives in Norwich at 15:55. Would you like me to book a ticket for you? Sentence5: 1 ticket on TR8314 has been booked. Your total is 17.6 GBP, which you can pay at the station. Your Reference number is : H0JS8RMF . Sentence6: I am not finding a 2 star in the centre. Are you sure there is not another type of hotel you would like? Sentence7: Do you have anything that is 2 star rated in the centre? Sentence8: YES PLEASE. FOR 1 PERSON. Sentence9: I have 2 options - one is cheap and one is expensive. Which price range would you prefer? Sentence10: Thank you for calling. Have a great day! Goodbye. Sentence11: I do need a place to stay, so are there any 4 star hotels available? Sentence12: we got none. can i help you with anything else? Sentence13: That is all I need. Sentence14: cheap will work. can you book it for Wednesday? 1 person, 2 nights. I'll need the reference number too. Sentence15: Thanks, that was all I needed today. Goodbye. Sentence16: I was able to book a room at Alexander bed and breakfast, your reference number is VWF48IZM . Is there anything else I can help with? Question: Who has spoken the sentence 12? (A) User (B) System

Ex Output:
Answer: (A) User

Ex Input:
Sentence1: It is free admission into the King's college. Sure I can help with that. What is your price range? Sentence2: There is pizza express it's moderately priced, would you like more information or for me to book it for you? Sentence3: That was all I needed, thank you. Sentence4: I was able to book your table. The Reference number is : WA5JKA4G . Is there anything else you needed? Sentence5: Yes. Do you know what their entrance fee is? Also, I need some help finding an Italian restaurant in the centre area. Sentence6: I don't have a price range preference. Sentence7: Thank you! Sentence8: I also need a taxi to travel between King's College and the restaurant. Sentence9: Yes please. I would like the reservation for Thursday at 15:00 for 2 people. Sentence10: I am looking for King's College. Sentence11: May I help you with any thing else? Sentence12: thanks for using our services and welcome anytime Sentence13: Booking completed! Booked car type : blue tesla Contact number : 07982639539 Sentence14: Yes, King's College is in the centre and located on King's Parade. Their phone number is 01223331100. Question: Who has spoken the sentence 8? (A) User (B) System

Ex Output:
Answer: (A) User

Ex Input:
Sentence1: No, I'm afraid there aren't. Sentence2: Could you look for something that isn't a guesthouse then? Sentence3: Are there any 4 star guesthouses in the north available? Sentence4: I guess I will take the guest house. Sentence5: I'm sorry, but I'm afraid we'll need to try different criteria. Would you be willing to change what part of town you stay in, or the star rating you need? Sentence6: I'm also looking for a hotel to stay in. I need to make sure it's a hotel and not a guesthouse, with a star of 4. Sentence7: i want to go to a park Sentence8: I have three 4 star hotels. what are or price range do you prefer? Sentence9: Yes, please, for 6 people, for 4 nights, starting Wednesday. Sentence10: There are no hotels that meet your requirements. Sentence11: the hotel by 14:45. Sentence12: I'm sorry but there are no parks in the area of your hotel. Sentence13: i aslo want to book a taxi to commute between the two places. Sentence14: I'm sorry, I don't have any 4 star hotels in the north. Would another area be ok, or should I check other star rating options? Sentence15: anywhere is fine. May I get a postcode ? Sentence16: But I said I would take the guesthouse. Sentence17: Okay, Do I need to book that for you? Sentence18: The price doesn't matter. I do want it to be in the north area of town though. Sentence19: There are 5 different parks. Postcodes are CB21JF, CB18DW, CB46AZ, CB22AD, and CB223AE. Sentence20: I'm sorry, but I don't think we determined which park you wanted to visit. Where will you be departing from? Sentence21: Sure, there are a few. What part of town do you prefer? Sentence22: I'm so sorry about that. You are booked at the Acorn Guest Lodge. Reference number is : R68P0A12 . Question: Who has spoken the sentence 18? (A) User (B) System

Ex Output:
Answer: (A) User