You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Help me in booking a flight from AUS to DCA?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are Feb 25 to Mar 01.

ASSISTANT: Ok, could I have your name please?

USER: I am Deborah Young.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer single connection flight.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a great day.