You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book my ticket from Atlanta, ATL to Washington, DCA. Can you please help me with booking?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Ok, my planned travel dates are from Aug 01 to Aug 03.

ASSISTANT: Ok, please provide me your name.

USER: Sure, Mary Martinez here.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.