Teacher:You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Teacher: Now, understand the problem? Solve this instance: Sentence1: Yes, book me for Sunday departing from london kings cross. Sentence2: Your booking is successful. Train is leaving at 07:17 and it costs 151.04 GBP. Your reference number is 5Y7XKAJY . Anything else I can help with? Sentence3: I need a not later than 9:15 train to Cambridge. Sentence4: 8, please Sentence5: How many tickets will you require? Sentence6: It looks like there's a train for Cambridge with an arrival time of 07:07. Would you like me to book that for you? Sentence7: Okay thank you for calling. Don't hesitate to call us again. Sentence8: No thank you that's I need! Question: Who has spoken the sentence 3? (A) User (B) System
Student:
Answer: (B) System