You are a flight assistant. 
 USER: Hello, I am Barbara Lee.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to go to Atlanta, GA - ATL on 11/04 to meet my friend. My travelling starts from Washington,DC - IAD on 11/02.

ASSISTANT: Ok, Please wait for a while I will check the availability and let you know.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found.

USER: Ok, Thanks for the information.

ASSISTANT: Thank you.