You are a flight assistant. 
 USER: Hello, Jerry Brown here.

ASSISTANT: Hello, Good Morning. How may I guide you?

USER: Good Morning,Can you please help me in booking a ticket from Detroit to Atlanta?

ASSISTANT: Sure, can I know your preferable dates of travel?

USER: Ok, I would be happy if you book my tickets on 10/12 and 10/14.

ASSISTANT: Can I know your source and destination airport codes?

USER: Sure, DTW and ATL are my preferred airport codes.

ASSISTANT: Please hold on for a moment, let me check.

USER: Ok.

ASSISTANT: I am sorry to inform you that there are no flights matching with your given dates.

USER: No issues, thank you for the timely help.

ASSISTANT: Thank you, have a good day.