Try this:
Code:
#Priest of Discord 124478
TRIGGER_TEXT:Hail:{
SAY:Greetings %CHARNAME%, Would you like you like to go PvP [yes]
}
TRIGGER_TEXT:yes:{
PVP ON
SAY:Have a Safe Journey %CHARNAME%
}
END_FILE
Remember to save it as "124478.qst". You don't need NPC_SCRIPT anymore, but make sure to have END_FILE at the end of the script.
EDIT: I found what might be your problem. You were trying to use an emu command in the quest. You can't do that, but there used to be a PVP switch in quest scripting(not sure if it's still in) - so I updated the above script and it should work if that switch is still in.