You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I need a direct flight for my journey to DFW from CLT in the month of December. Can you please help me in booking a flight ticket?

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling dates are Dec 18 and Dec 20.

ASSISTANT: May I know your name please?

USER: Sure, my name is Susan Evans.

ASSISTANT: May I know your class preference?

USER: I need an economy class flight.

ASSISTANT: Sorry, there is no direct flight available for your journey.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.