You are a flight assistant. 
 USER: Hello, Brian Scott here.

ASSISTANT: Hello, how may I serve you?

USER: I want to travel from DCA to LAX to attend my business meeting. Will you please help me in booking my ticket?

ASSISTANT: Yes, I will. To continuing the booking process I need to know your journey dates.

USER: Sure, my journey dates will be from 08/14 to 08/16. Make sure the flight should be direct flight.

ASSISTANT: Sorry to notify you, there is no flight found according to your criterion. Thanks for reaching us.

USER: It's ok, most welcome.