You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am James Baker.

ASSISTANT: Ok.

USER: I want to attend for client meeting in Washington, so please book a connecting flight for me.

ASSISTANT: Sure. May I know your source code?

USER: My source and destination airport codes are DC - DCA, DC - IAD.

ASSISTANT: Please, share your journey dates.

USER: I would like to start on 12/05, return on 12/07.

ASSISTANT: Wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights found on your route.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.