All I have is
workspace.Part.Dialog.InUse:Connect(function(Player) print(Player) end)
Insert a LocalScript into StarterGui and place the code below inside it
local Player = game.Players.LocalPlayer workspace.Part.Dialog.Changed:Connect(function() if workspace.Part.Dialog.InUse == true then print(Player.Name) end end)
(Not tested in studio might not be 100% accurate)