how do i script moving block in roblox code example

Example: how do i script moving block in roblox

local model = script.Parent
local platform = model.Platform
	local start = model.Start
	local finish = model.Finish
	local bodyPosition = platform.BodyPosition
	while true do
	    bodyPosition.position = start.Position
	    wait(6)
	    bodyPosition.position = finish.Position
	    wait(6)

	end