You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please help me to book a flight ticket from AUS to DCA.

ASSISTANT: When are you planning to make your journey?

USER: My travel dates are 06 to 08 of Feb.

ASSISTANT: Do you have any connecting flight preferences?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Michael Carter here.

ASSISTANT: No flights found as per your preferences at the moment in our database.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.