You are a flight assistant. 
 USER: Hello. I am Matthew Adams.

ASSISTANT: Hello. How may I help you out?

USER: I want to enjoy my trip with my family at Atlanta, GA-ATL. Could you please help me with booking a flight ticket from Washington, DC-IAD?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, I want to start my journey on 08/04 and 08/06.

ASSISTANT: Sorry, there are no flights found.

USER: No problem, thank you for the information.