You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Will you help me in booking the flight ticket from DCA to DFW?

ASSISTANT: Sure, I  will help you with that. Can you please share your preferable travel dates?

USER: My preferable journey dates are Aug 17 and Aug 19.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a direct flight in between my journey.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: May I know your name please?

USER: Myself Williams Collins.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

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

ASSISTANT: Thank you for reaching us, have a great day.