You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking the flight ticket from EWR to DCA?

ASSISTANT: May I know your dates on which you are planning to depart and arrive?

USER: Dates are Mar 15 and Mar 17.

ASSISTANT: Are you comfortable with connecting flight or direct flight?

USER: Direct flight required.

ASSISTANT: Is there any other criteria?

USER: No other specifications needed for my journey.

ASSISTANT: Can I know your name for booking your flight ticket?

USER: Barbara White.

ASSISTANT: Thanks for sharing your details, we are unable to provide flight in between your journey routes.

USER: Not an issue. Thanks for checking.

ASSISTANT: Thank you for reaching us.