You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Do you need any immediate help that I can aid you?

USER: I am James Rodriguez. Can you please help me to book a flight ticket from CLT to DCA?

ASSISTANT: Sure, I can help you in flight ticket booking with free of cost . Can you please mention your journey dates?

USER: My journey dates are Mar 1 to Mar 3.

ASSISTANT: Can you please mention your airline preference?

USER: No.

ASSISTANT: Can you please share do you have any other needs?

USER: I am looking for a flight with business class.

ASSISTANT:  There is a flight which will departure from CLT at 4:00 AM and the flight number is 1004 in Southwest airlines, can I confirm your flight ticket booking? I regret to say that the above flight is not a business class and it is economy class, do you want to book it?

USER: No, I want to travel in business class only.

ASSISTANT: Sorry, there is no business class flight on your travel dates.

USER: No problem, thanks for your information.

ASSISTANT: You are most welcome and have a nice day.