You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please help me in booking flight ticket from CLT to DFW.

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: My trip dates are Apr 18 to 20.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: I need to travel in business class.

ASSISTANT: May I know your good name please?

USER: Myself Michelle Lopez.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Thanks for providing details, we are unable to provide flights on your journey routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.