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

Example Input: Sentence1: Hi, I just had a fight with someone regarding an automobile accident we had and I need to contact the police! Sentence2: I have the parkside cambridge police telephone 01223358966. Sentence3: always welcome. at your service Sentence4: Thank you, Goodbye Sentence5: I'm not sure where you are, but the police postcode is CB11JG. Sentence6: Can I get the zip code or postal code for the area I'm in right now? Question: Who has spoken the sentence 3? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Booking was successful for Tuesday. Your Reference number is : 0J3V1091 . Sentence2: I'm sorry that doesn't seem to be available would you like me to try a different day or guesthouse? Sentence3: I'm sorry, there does not seem to be a historical site or hiking area in Cambridge. Is there anything else I can help with? Sentence4: Sure, I can help you with that. What section of town were you looking for? Sentence5: Doesn't really matter if they offer either of those or not. I just want it to be a 0 star hotel. Sentence6: Then the city centre north b and b is what you want, shall I book you? Sentence7: i don't really care about the area. Sentence8: I want to see local sights, can you help? Sentence9: I like hiking and seeing historical sites. Sentence10: Okay. Are you interested in hotels that offer internet and/or parking? Sentence11: Yes, I would like to find a hotel in the cheap price range? Sentence12: Yes, a guesthouse is fine. I was looking for zero stars and in the cheap price range. Sentence13: Great, thanks. I don't need anymore help. Goodbye! Sentence14: Yes, please book it for me. Sentence15: I'm sorry, I seem to be having an error in my system. You want a booking at the citycentre north B&B for 6 people, 5 nights, on Monday? Sentence16: I'm also looking for somewhere to go. Perhaps the college. Can you tell me the postcode for the college? Sentence17: City Cenrtree North and B is a cheap hotel,would you like me to book it for you ? Sentence18: Let book the same but on Tuesday instead. Sentence19: I'm happy I could help today. Goodbye! Sentence20: There are 18 colleges in town. I recommend christ's college in the centre. The postcode is cb23bu. Sentence21: Yes, there is a wide variety, do you have an activity type that your are interested in? Sentence22: Yes please, 6 people for 5 nights and we would be arriving Monday. Question: Who has spoken the sentence 21? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I do not, thank you for the information Sentence2: OK, what is your departure station and what day are you traveling? Sentence3: I have 6 expensive British restaurants. Is there an area of town you'd like to be in? Sentence4: I would recommend the grafton hotel restaurant, located at Grafton Hotel 619 Newmarket Road Fen Ditton on the east side of town. Do you need more information? Sentence5: sorry, there are no trains from leicester to cambridge on wednesday. Sentence6: Okay, sorry about that. I hope we can help you in the future. Sentence7: I'm departing Leicaster on Wednesday. I need a booking for 1 person with a reference number please. Sentence8: I'm sorry, there are no trains that meet your criteria. Do you have any alternative options? Sentence9: No, there is no particular area I would like to be in. Sentence10: Hello, I'm looking for an expensive restaurant that serves british food please Sentence11: Okay, may I help you with anything else? Sentence12: Are you sure there are no trains from leicester to cambridge on wednesday before 14:45? That seems odd to me. Sentence13: i would also need the phone number Sentence14: I really only need a train for that route. Thanks for your help. Sentence15: Yes, I'm looking for a train that's heading to Cambridge by 14:45. Sentence16: 01223241387 is the phone number. Can I help you with anything else today? Question: Who has spoken the sentence 1? (A) User (B) System
Example Output:
Answer: (B) System