You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Need your assistance for booking a flight ticket to JFK with a direct flight.

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are on Jan 17 and 19.

ASSISTANT: From where you want to start your journey?

USER: I am heading from DCA.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, my name is Dorothy Evans.

ASSISTANT: Sorry, there are no flights found on your data.

USER: Ok, thanks for your service.

ASSISTANT: Thank you.