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

Example Input: Sentence1: Hello, I'm looking for an Italian restaurant on the East side. Thank you! Sentence2: Is this restaurant in the moderate price range? Sentence3: Let me know what else you need . Sentence4: Have a nice day then! Sentence5: Thank you for your help. Bye. Sentence6: Yes book a table for 8 on sunday at 19:30 please. Sentence7: No I will call back thank you. Sentence8: Can you find another restaurant int he same area and price range for me? Sentence9: I did not say to book rajmahal. What type of food does it serve? Sentence10: I was able to book rajmahal, reference number is KSFSKIC1 Sentence11: The address and phone for the Rajmahal is 7 Barnwell Road Fen Ditton cb58rg, 01223244955. Enjoy our city. Sentence12: They serve Indian food. Sentence13: Your reservation is made. The number is KSFSKIC1 . Sentence14: If there are not any Italian restaurants available in the area that are moderately priced, Rajmahal will be fine. Sentence15: I hope to. Goodbye. Sentence16: I show one called the PIZZA HUT FEN DITTON that serves Italian style food and is located on the east side in the Cambridge Retail Park Newmarket Road Fen Ditton Sentence17: It is listed in the moderate range. Would you like to book a reservation? Sentence18: I'm sorry, we were not able to book a table at that restaurant. Would you like me to find another restaurant? Question: Who has spoken the sentence 12? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: Where will you be travelling to? Sentence2: Yes but I need that to be booked for 3 people. I would like the reference number please. I also need a place to stay as well. Sentence3: Sure thing, I would suggest this one acorn guest house. Sentence4: I will be traveling to Leicester and would like to arrive before 21:15. Sentence5: I would like a 4-star guesthouse in the north in a moderate price range. Sentence6: Great can you book that for me from Sunday for 2 nights for 4 people. Sentence7: I would like to arrive by 21:15. Sentence8: When could you like to arrive by? Sentence9: Your booking was successful. Your reference number is 7ZJ4CTTG . Will that be all for today? Sentence10: Booking was successful, the total fee is 113.4 GBP payable at the station. Your reference number is ABKFF3SH . What type of place are you looking for? Sentence11: I'm looking for a train that leaves from Cambridge on Tuesday. Sentence12: I have the TR8207 that will arrive by 21:06. Would you like me to book that for you? Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: Yes, I've booked your table, they'll hold it for 15 minutes. Your reference number is 4ATJMY42 . Is there anything else I can help you with? Sentence2: kymmoy is in the expensive price range in the centre of town. Sentence3: The are on trinity lane and the post code is cb21tt. Is there anything else I can assist you with? Sentence4: Thank you and enjoy your stay in Cambridge! Sentence5: Yes, there are many places to visit near the restaurant. What kind of attraction did you have in mind? Sentence6: Yes, can you help me find some places to visit near the restaurant? Sentence7: I'm not sure. What is available? Sentence8: No, you've helped me with everything! Thanks, bye! Sentence9: Great, can I get the address and postcode. Sentence10: There is architecture, boat, cinema, college, concerthall, museum, nightclub, park, swimmingpool, theatre Sentence11: Its my first time in town, so I dont know which places are good. I am open to suggestions, so I will go with your recommendation Sentence12: Can you make a reservation for 5 people at 18:00 on wednesday for me please? Sentence13: old schools is a popular architecture attraction located on trinity lane. It is free to enter. Sentence14: Hello, I am traveling to Cambridge and I'd like to find an expensive place to dine in the centre. Question: Who has spoken the sentence 7? (A) User (B) System
Example Output:
Answer: (B) System