You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jerry Mitchell.

ASSISTANT: Jerry, how can I assist you?

USER: I have to participate in a sports event in Washington, can you please help me in flight ticket booking?

ASSISTANT: Sure, please provide your genesis and terminus airport codes.

USER: Sure, my genesis airport code is DCA and my terminus airport code is DCA because it is a round trip.

ASSISTANT: May I know your itinerary dates?

USER: Sure, my itinerary dates are 06/13 and back on 06/15.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, that's fine. I can approach another way to reach my location. Thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.