You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
One example: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Solution is here: Answer: (A) User
Explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

Now, solve this: Sentence1: There is an error in that train booking could I book the TR2519 from Cambridge to Birmingham New Street, on Friday, departing at 15:01? Sentence2: Yes, that would be great. I'd like to book two tickets and I'll need a reference number, please? Sentence3: Of course. I reserved the table for you. Your reference number is D9XHCFDT . Sentence4: that is all for now, thank you very much. Sentence5: Booking was successful, the total fee is 150.19 GBP payable at the station. Reference number is : LCEXHUAZ . Sentence6: Two tickets please. Sentence7: Thank you for your help. Sentence8: No specific area for the restaurant. Sentence9: Sure, there are a number of expensive options. Did you have a certain part of town in mind? Sentence10: the good luck chinese food takeaway fits those criteria, can I make a booking for you? Sentence11: Where are you coming from? Sentence12: I'm also looking for a chinese restaurant that is semi expensive. I would like it the same day I arrive. Sentence13: I want a train department from Cambridge and going to Birmingham New Street on Friday at 14:45. Sentence14: Do you need me to book transport or provide anymore info? Sentence15: I need a train going to cambridge that leaves after 14:45. Sentence16: I can put you on the tr8842 it leaves at 15:17 how many tickets please Sentence17: Yes, I would like to book it for 2 people at 10:00 please. I'll need it for Friday please. Can I get the reference number please? Sentence18: You're welcome, have a great day! Question: Who has spoken the sentence 7? (A) User (B) System
Solution:
Answer: (B) System