You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book a flight ticket from DCA to EWR.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are Sept 12 and 14.

ASSISTANT:  Do you require any stopovers in your journey?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: My name is Donna Martinez.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.