Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: No, thank you and that is all i needed. Sentence2: I need to book a train from Cambridge and Norwich on Wednesday and I need to be there at 15:30. Sentence3: When would you like to leave by? Sentence4: And the departure time please? For the train that arrives closest to 15:30? Sentence5: Thank you, have a nice day, goodbye. Sentence6: I don't care when I leave as long as I get there by 15:30. Sentence7: The departure time is 13:38 and it arrives at 14:55. Would you like me to book it for you? Sentence8: Can I get the departure and travel time of the train arriving closest to 15:30? Sentence9: The travel time is 79 minutes. Sentence10: There are 9 trains matching your query. Shall I book one? Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System