You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please reserve me a flight ticket from DCA to DFW?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are Sept 17 and Sept 19.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Anna Martin.

ASSISTANT: Sorry Anna Martin, no direct flight is available on your route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.