You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me to book a flight from EWR to CLT?

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Sept 02 to 04.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer direct flight.

ASSISTANT:  If you can help me with your name, I can begin looking up for the availability of flights.

USER: I am Karen Johnson.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: No other preferences.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.