Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Problem:Sentence1: I apologize. You're booked at the Hamilton Lodge and your Reference number is : UC7W5EFU . Can I assist you with anything else? Sentence2: I have 3 star guesthouses in the north. One has free wifi and parking while the other has neither. Which one would you prefer? Sentence3: I'm afraid 06:55 is the earliest I could find. Sentence4: What? 16:15 is later that 6:55. Are you saying you have nothing arriving in almost 10 hours after 6:55? Sentence5: No problem. I have the rooms booked for you. What else can I do? Sentence6: The one with wifi will work. I need to book it for Friday, 5 nights, 4 people. Sentence7: Okay thanks. Can you also help me find somewhere to stay? I'd like a guesthouse in the north preferably with a 3 star rating. Sentence8: Okay, your booking was successful. The total fee due at the station is 70.4 GBP. The reference number is 8RU6MZ5J . Sentence9: Thank you for contacting us have a nice day. Sentence10: Yes I would like this train booked. I need ticket for 4 people. I also need the reference number please. Sentence11: Sorry, there was a miscommunication earlier. TR8314 is your best bet. It will arrive in Norwich at 15:55 on Friday. Sentence12: Reference number please, come on, this is taking too long. And I didn't even get the hotel name from you, is there a manager? Sentence13: Of course. There is a train leaving Friday at 5:36. Would you like me to book it for you? Sentence14: It arrives by 06:55 would that be okay to book for you? Sentence15: I'm looking to book a train that will depart out of Cambridge. Can you give me information about trains that leave Cambridge and arrive in Norwich? Sentence16: What time does it arrive? Sentence17: No I need one that arrives at 16:15. Sentence18: That was all I needed. Sentence19: TR2534 arrives at what time? Sentence20: TR2534 arrives that time. can i book for you? Question: Who has spoken the sentence 18? (A) User (B) System
Solution:
Answer: (A) User