NPC Start Conversation

SCN NPCCaveTriggerSCRIPT

short  doonce

BEGIN OnTriggerEnter Player ; this is so it will only trigger for the player, no other NPCs

NPCref.Startconversation player, dialogtopicname
set doonce to 1 ; so it doesnt' happen every time you trigger, only the first time

END

See reference http://geck.bethsoft.com/index.php/StartConversation

Note, reported by poster that NPC seems to always be in combat and always uses “Greeting.”