How to get one part to face another part?

I've been mucking around with some quick sloppy code trying to get one Part to face another Part, but I haven't seem to be able to get that to happen. I have been reading on the CFrame section on the ROBLOX wiki, I just don't really understand it all that much.

Here's my code;

local p = script.Parent

while wait() do
    local b = script.Parent.Parent.Base.CFrame
    local obj = game.Workspace.Dummy.Head.Position
    local x, y, z = obj.X, obj.Y, obj.Z
    p.CFrame = CFrame.new(b.p + Vector3.new(0, 0.65, 0), Vector3.new(x, 0, z))
end

If someone is able to help explain to me what I'm doing wrong and how exactly CFrame values work, it would be a great help to me.