You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Robert Brown here, can you please help me in booking the ticket from ATL to DCA? As I'm planning to attend an interview over there.

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

USER: Sure, my travel dates are 02/04 and 02/06.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome.