You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me in booking flight ticket?

ASSISTANT: Sure. May I know your details for further process?

USER: My origin is DC-DCA, Destination is DC-IAD.

ASSISTANT: May I know the journey dates?

USER: Sure, Depart is on Aug 5 and arrival is on Aug 7.

ASSISTANT: Sorry to say you, no flight has been found on the specific dates you provided.

USER: OK, Thank you.

ASSISTANT: May I know your name?

USER: Myself James Edwards.Thank you.

ASSISTANT: Thank you.