Test

wait(1)
local function callback(text)
    if text == "Yes" then
    print("User said yes")
    elseif text == "No" then
    print("User said no")
    end
end

local bindableFunction= Instance.new("BindableFunction")

game.StarterGui:SetCore("SendNotification", {
    Title = "Grim loaded";
    Text = "Have fun ok?";
    Icon = "";
    Duration = "5";
    callbakc = bindableFunction;
    Button1 = "Ok! Sure";
    Button2 = "No thanks nub.";
})