You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Myself Daniel Anderson, will you help me in booking the flight ticket from LAS to DCA?

ASSISTANT: I am here to help you with that. Can you please provide your planned dates of journey?

USER: My travelling dates are July 30 and Aug 01.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: My return time must be in evening.

ASSISTANT: Do you need stop over in between your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements about your journey?

USER: No, thank you for asking.

ASSISTANT: Sorry to say this Daniel Anderson, there are no flights as per your requirements which can travels to your region.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome, thank you for reaching us.