You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, In what way can I assist you now?

USER:  Help me in booking a flight form LAS to DFW?

ASSISTANT: Sure, can I know your good name please?

USER: I am Stephanie Hall.

ASSISTANT:  When you are willing to travel?

USER:  My travelling dates are Mar 29 to 31.

ASSISTANT: Do you have any other restrictions to be met?

USER: I want direct flight.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.