Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Great. Can you please give me the travel time and price? Sentence2: I'm actually in need of a train leaving Thursday after 16:00 from Cambridge to London Kings Cross. Can you find me one? Sentence3: Thank you very much. Sentence4: Yes, the travel time is 51 minutes, and the price is 23.60 pounds. Sentence5: Certainly, the earliest train by your specifications is TR1791, leaving at 17:00 and arriving at 17:51. Would you like to book that train? Sentence6: Your very welcome! Have a nice day! Sentence7: Okay. Thank you again. Sentence8: Thank you! That's all I needed. Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System