You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I want to book a flight ticket from Washington DCA to LAS. Can you find a flight ticket for me?

ASSISTANT: Sure, when are you planning to make your trip?

USER: Ok, my planned journey dates are on Sept 04 and return on Sept 06.

ASSISTANT: Do you need a connecting flight or direct flight?

USER: I need a single connecting flight.

ASSISTANT: Any other requirements to be met?

USER: No, thanks for asking.

ASSISTANT: May I know your name?

USER: I am Jonathan Robinson.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.