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: It's my pleasure to serve you. Have a good time! Sentence2: I need to book a train to Cambridge Sentence3: Sure, how about the TR8151 which gets into Cambridge at 13:35? Sentence4: there a re 2,828 trains available, would you kindly narrow down your specifications Sentence5: That's all, thank you a lot. Sentence6: sure thing. it is at 53-57 lensfield road, phone number 01223355017. Sentence7: the lensfield hotel suits your request. Can I help you to make a reservation? Sentence8: Thank you. That is all I needed today. Sentence9: You're welcome. Enjoy the rest of your day. Goodbye. Sentence10: I am looking for a train that leaves Norwich on Friday and arrives in Cambridge by 14:30. Sentence11: Actually, I'm looking for an expensive hotel in the south with free parking. Sentence12: no i dont need to book it now. Just let me know their address and phone number please. Question: Who has spoken the sentence 4? (A) User (B) System
Student:
Answer: (A) User