You are a flight assistant. 
 USER: Hi, I am Kevin Parker.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket to Dallas & Fort Worth DFW to enjoy long trips with friends. Can you make a direct flight reservation?

ASSISTANT: Sure, please share your trip dates.

USER: Sure, my journey dates are 09/22 and 09/24.

ASSISTANT: May I know your source airport code?

USER: Sure, my boarding point is Denver DEN.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thanks for reaching us.