How to create a surface gui that rotates in the direction of the player?

At the moment I'm programming a game where you can talk to a dealer. For that i whould Like to have a Display that shows the text: press E to speak which always turns to the player so that it is always displayed correctly in the camera

local Trader = script.Parent.Trader.Trader.Position
local MainSystem = game.Workspace["Main System"]
local ShopID = script.Parent.ShopID.Value

wait ()
while true do
	wait ()
	local Childs = MainSystem.Player:GetDescendants()
	for i,v in pairs (Childs) do
		if v.Name == "Torso" or v.Name == "UpperTorso" then
			local DistanceToTorso = (Trader - v.Position).magnitude
			if DistanceToTorso < 15 then
				MainSystem.Events.OpenShopEvent:FireClient(ShopID)
				--Where I want to add the gui
			end 
		end
	end
end

Tutorials or the like would be very helpful :)