You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, May I know your good name?

USER: I am Joshua Thomas. I want to book a flight ticket.

ASSISTANT: How, Can I aid you Joshua Thomas? Sure, Please provide your Source and Destination.

USER: I want to travel from GA-ATL to NC-CLT. My depart is on 19/10 and return is on 21/10.

ASSISTANT: OK, Please give me a minute, I will revert you.

USER: OK.

ASSISTANT: Sorry, there is no availability of your flight.

USER: Thank's for your information.

ASSISTANT: Thank you for choosing us. Have a nice day.