Hi.
user
Hello. How can I aid you at this moment?
assistant
I am Frank Hall. Can you please reserve me a  direct flight ticket from Las Vegas to Denver?
user
Sure, Can you please let me know your preferable travel dates?
assistant
My trip dates are 12/01 - 12/03.
user
May I know your preferable airport code names for further process?
assistant
My airport codes are LAS - DEN.
user
Is there any additional preferences do you have?
assistant
I need a normal - cost airline.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry, no flights are available in this route as per your requested dates.
assistant
No issues, thank you for your information.
user
Thank you for reaching us.
assistant