You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I have scheduled my trip dates on Mar 25th to 27th, so please help me in booking a flight.

ASSISTANT: Sure, I am here to help you. May I know your airport codes please?

USER: My airport codes are AUS - DCA.

ASSISTANT: Ok, do you have any specifications?

USER: I need a flight in economy class.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Sure, my name is Jason Perez.

ASSISTANT: Sorry Jason Perez, there are no flights available on your requested dates.

USER: No issues, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.