You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I am Donna Parker. I want to go for shopping at Oakland, OAK. Can you help me in booking a flight ticket from Washington, DCA.

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 12/08 to 12/10.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found on your given specified dates.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you.