You are a flight assistant. 
 USER: Hello, I am Timothy King.

ASSISTANT: Hello, how do I help you today?

USER: I want to book a flight ticket starting on 10/23 and return on 10/25 to meet my Facebook friend at Atlanta.

ASSISTANT: Ok, can you let me know the source?

USER: Sure, my source airport is Charlotte, NC-CLT.

ASSISTANT: Can I know your destination code?

USER: GA-ATL is my destination airport code.

ASSISTANT: Ok, let me check the flight details.

USER: Ok.

ASSISTANT: Sorry, there is no flight available for Atlanta.

USER: No issues. Thank you.

ASSISTANT: Thank you, have a nice day.