You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight ticket from New York, JFK to Washington, DCA?

ASSISTANT: Sure, please share me your travel dates.

USER: My journey dates are from Aug 18 to Aug 20.

ASSISTANT: May I know your class preferences?

USER: I am ok with any class.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a direct flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Frank Hall.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, that's not a problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.