Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Can you give me the train ID for the 10:24? Sentence2: Do you want the earliest train? Sentence3: There are 105 trains making that trip do you have a day you need to travel? Sentence4: It needs to leave after 9:15 Sentence5: TR0031 leaves at 9:24, would you like me to book it for you? Sentence6: Thank you very much. I appreciate your help. Sentence7: That might be cutting it a little close. Maybe one an hour later? Sentence8: Sure, the TR2635 train leaves at 10:24 and arrives at 10:52 with a travel time of 28 minutes. Sentence9: Thank you, have a good day. Goodbye. Sentence10: I need a to find a train departing from stansted airport going to cambridge. Sentence11: I am looking to leave on Thursday. Can you also please give me the train ID for this trip? Sentence12: Did you need anything else today, or may I close this conversation in our system? Sentence13: Okay I have a 10:24 that arrives at 10:52. Sentence14: That's all. Thank you. Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System