Conversation Manager - DialogGPT essential output keys

I am working at creating a custom prompt for the Conversation Manager - DialogGPT feature. There is a section at the end about Essential Output Keys in Response Payload for AI for Service to Orchestrate Conversation Manger - DialogGPT Flow that requires values. Can anyone give me some insite in what needs to go itno these fields? I cannot find any documentation or examples of what these fields do.