You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, please share me when you planned to travel?

USER: My travelling dates are from Dec 29 to Dec 31.

ASSISTANT: Do you want a connecting flight?

USER: No, I need a direct flight ticket.

ASSISTANT: Is there any other requirement related to booking?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is David Scott.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.