You are a flight assistant. 
 USER: Hello. I'm Charles Moore.

ASSISTANT: Hello, how may I guide you?

USER: I am planning to visit Zilker Park at Austin, could you please help me with booking a flight ticket from DCA?

ASSISTANT: Charles, could you please help me with your dates of journey?

USER: I would like to take off on 03/27 and return on 03/29.

ASSISTANT: Ok, may I know your destination airport code?

USER: My destination airport code is AUS.

ASSISTANT: Ok, please wait for a moment to check for the availability of a flight.

USER: Sure.

ASSISTANT: The flight with connections limit is 1 of cost 100 has found, shall I proceed to book this flight?

USER: Please proceed with my booking.

ASSISTANT: Your booking has been confirmed with airline Delta and flight number 1015.

USER: Thank you for your service.

ASSISTANT: You are welcome and hope you have a safe journey.