You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a flight ticket from JFK to DFW.

ASSISTANT: Sure, could you please mention with your dates of journey?

USER: My journey dates are Mar 07 to Mar 09.

ASSISTANT: May I know your name please?

USER: Myself Kenneth Brown.

ASSISTANT: Do you have any other specifications please?

USER: I preferred business class.

ASSISTANT: Please wait for a moment. Sorry Brown, there is no flight found as per your travelling details.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.