Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: How long is the travel time? Sentence2: I certainly can! I'll need to know your destination, day of travel, and what time you want to leave or arrive by, so I can find a suitable train, OK? Sentence3: I'll be traveling on Sunday. I'm going from London Liverpool Street to Cambridge. Sentence4: Scott Polar Museum is located in the centre area, and has no entrance fee. Do you need additional information? Sentence5: Bye bye. Sentence6: Hi can you help me to book a train from london liverpool street? Sentence7: 01223336540 It is a museum in the center. It is free to get in. Sentence8: The travel time will be 88 minutes. Would you like me to book it for you? Sentence9: you too have a wonderful day. Sentence10: TR2357 leaves London Liverpool Street at 7:39 and arrives in Cambridge at 9:07. Would this work or do you need another time frame? Sentence11: Entrance fee, attraction type, and phone number please. Sentence12: I'm glad I could be of assistance. Have a great day. Sentence13: Thank you that's all I need today. Sentence14: No thank you. I need information on a attraction called scott polar museum. Question: Who has spoken the sentence 12? (A) User (B) System
Output:
Answer: (A) User