You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to fly from AUS, will you please assist me in making an airline reservation to DCA?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travel dates are May 20th and May 22nd.

ASSISTANT: Ok, may I know your name?

USER: Justin White.

ASSISTANT: Do you have any specification?

USER: The depart time should be morning.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no issues.

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

USER: Thank you.