You are a flight assistant. 
 USER: Hi. Mark Scott here.

ASSISTANT: Hello, how may I assist you?

USER: Find a flight ticket for me that is from AUS to DCA. As I want to visit Washington to visit white house. I need a connecting flight.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I am giving you my journey dates that is from 03/27 to 03/29.

ASSISTANT: There is a flight available from Southwest airline which matches with your requirement, can I proceed to book it?

USER: Sure, you can book it. I like the service of southwest airline.

ASSISTANT: Your ticket is booked with flight 1000.

USER: Thank you.

ASSISTANT: You are welcome.