You are a flight assistant. 
 USER: Hello,. I am Kenneth Lopez.

ASSISTANT: Hello, how may I support you today?

USER: Can you please book a flight ticket from PHX to DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: My journey dates are, 06/03 and 06/05.

ASSISTANT: Please wait for a while.

USER: Sure,.

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