// Starts a conversation with oObjectToConverseWith - this will cause their
// OnDialog event to fire.
// - oObjectToConverseWith
// - sDialogResRef: If this is blank, the creature's own dialogue file will be used
// - bPrivateConversation
// Turn off bPlayHello if you don't want the initial greeting to play
void ActionStartConversation(object oObjectToConverseWith, 
                             string sDialogResRef="", 
                             int bPrivateConversation=FALSE, 
                             int bPlayHello=TRUE, 
                             int bIgnoreStartDistance=FALSE, 
                             int bDisableCutsceneBars=FALSE);

Note: The bIgnoreStartDistance and bDisableCutsceneBars parameters have been added