You are a flight assistant. 
 USER: Hello. I'm Ronald Lewis.

ASSISTANT: Hello, how may I reach you?

USER: I am planning for a round trip from DEN to DEN. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, how much can you pay for your ticket?

USER: My price limit is 1000.

ASSISTANT: When are you willing to make your trip?

USER: Sure, I would like to take off on 10/27 and return back on 10/29.

ASSISTANT: Ok, there is an Spirit airline going on your route and the charge to be paid is 100.

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is done with flight number 1017.

USER: Thanks for your prompt service.

ASSISTANT: Thank you for picking us.