Why Can't I Make the GUI Appear Again After Clicking It The Second Time?

So, the first time you click this, the dialog appears and it is fully functional. When you click the "goodbye" option of the dialog it disappears and all is well. But when you try to restart the dialog, the GUI doesn't appear. Any clues as to why?

Script named npcDialog:

local cd = script.Parent.Torso.ClickDetector

function onClick(player)
	local d = script.ShopKeeper_Dialog:Clone()
	if player:FindFirstChild("PlayerGui") and not player.PlayerGui:FindFirstChild("ShopKeeper_Dialog") then
		d.Parent = player.PlayerGui
		d.Enabled = true
	end
end
cd.MouseClick:Connect(onClick)

--Local Script in npcDialog named "dialogHandle"
local response1 = script.Parent.dResponse1.Response
local response2 = script.Parent.dResponse2.byeResponse
local dbox = script.Parent.dBox.dialogText

response1.MouseButton1Click:Connect(function(onclick)
	dbox.Text = "You cannot speak to me yet..*"
	response1.Text = "Oh.."
end)

response2.MouseButton1Click:Connect(function(onclick)
	script.Parent:Remove()
end)