Hello,. I am Mark Hall.
Hello. How may I assist you today?
Can you help me in booking a flight ticket from LAS to DFW?
Sure, may I know your planned travelling dates?
I want to travel on 12/22, and need to catch return flight on 12/24.
Do you need a connection in between your journey?
No, I need a direct flight.
 Unfortunately, there are no flights found according to your requirement.
Ok, no issues. Thanks for the information.
You are most welcome and thank you for consulting our agency.