You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: George Hernandez here. Please book me a ticket from ATL to DCA.

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

USER: My travelling dates are 07/31 and 08/02.

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

USER: Ok. No issues, Thank you for informing.

ASSISTANT: You are welcome.