You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Can I get travel time and price first, please? Sentence2: I would like to leave on Saturday from london liverpool street Sentence3: No, thank you. That's all I needed today. Sentence4: The trip is 50 minutes long and it is 13.20 pounds for a ticket. Sentence5: Ok thanks, Im ready to book. Sentence6: Thank you, goodbye. Sentence7: Okay, and which day would you like to travel? Sentence8: Yes, please. I need to know the price and travel time for that as well. Sentence9: Great, I have booked your ticket, your reference number is : 9LLWMNOM . May I help with anything further. Sentence10: TR7397 leaves from London Liverpool Street on Saturday at 05:39 and arrives in Cambridge at 07:07 with travel time of 88 minutes. Cost is 13.28 pounds. Shall I book this ticket? Sentence11: Please find a train that departs from Peterborough and arrives in Cambridge by 8:45. Sentence12: The TR3390 arrives Saturday at 8:38. Would you like me to book it for you? Sentence13: Train TR3390 is departing from peterborough to cambridge. Would you like me to look for a train departing from London Liverpool? Sentence14: I'm so sorry. I didn't mean to book yet. I won't need that reservation. Could you make sure that train TR3390 is departing from London Liverpool? Question: Who has spoken the sentence 3? (A) User (B) System
A:
Answer: (B) System