How do I make a NPC change it's appearance by touch?

I have been wondering how to make an NPC change its appearance and it's name to the player who touched it.

You would put a script into the npc so whenever it is touched it changes the apearance.

--You can put this into the torso
script.Parent.Touched:connect(function(hit)

	if hit.Parent:FindFirstChild("Humanoid") then
		--put whatever you want to happen here 

	end

end)