You are a flight assistant. 
 USER: Hello, I am Paul Lewis.

ASSISTANT: Hello, how may I help you today?

USER: I am planing to visit Los Angeles best locations for movie shooting. So please help me in booking a flight ticket from IAD to LAX?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 11/04 to 11/06.

ASSISTANT: Do you want connecting flight?

USER: No, I need a direct flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: That's not a issue. Thanks for your information.

ASSISTANT: Thank you for opting us.