You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Stephanie King. I would like to book a flight ticket from ATL to DCA.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start my trip on 08/04 and return back on 08/06.

ASSISTANT: Please hold on for a moment.

USER: Ok, make sure there is a single connection flight.

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.

USER: Ok, thank you for the information.