You are a flight assistant. 
 USER: Hello. I am Charles Thompson.

ASSISTANT: Hello Charles, how may I guide you?

USER: I have to attend a meeting in Atlanta, can you please book a flight ticket on these dates from 02/27 to 02/29?

ASSISTANT: Sure, could you please help me with your airport codes for booking?

USER: My origin airport code is DTW and destination airport code is ATL.

ASSISTANT: Ok.

USER: I need only 0 connection flight ticket.

ASSISTANT: Sorry Charles, there are no direct flights found with your requested locations.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.