Hi.
user
Hello, In what way can I assist you now?
assistant
 Help me in booking a flight form LAS to DFW?
user
Sure, can I know your good name please?
assistant
I am Stephanie Hall.
user
 When you are willing to travel?
assistant
 My travelling dates are Mar 29 to 31.
user
Do you have any other restrictions to be met?
assistant
I want direct flight.
user
Sorry to say that, there are no flights available on the routes of your journey.
assistant
That's ok, thank you.
user
Thank you for availing us.
assistant