Something

function Vehicle_OnProduce(user, menuitem)
--Talk to him first..
		if (menuitem == o)
				then
						user:inventory_modify("Speak with Tavernkeep", -1)
						user:message("Ahoy! What do you want to know about?")
		end
--Ask about adventure
		elseif (menuitem == 1)
				then
						user:message("I heard there was a treasure-loaded fortress around..")
		end