You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Brenda Roberts here. I want to attend a Marriage in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are 03/06 and 03/08.

ASSISTANT: Please help me with your journey codes.

USER: My airport codes are DCA and IAD.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Anyway, thanks for the information.