public static void Main()
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
            var engine = new HotelBookingSystemEngine();

            engine.StartOperation();
        }
 public static void Main()
 {
     Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
     var engine = new HotelBookingSystemEngine();
     engine.StartOperation();
 }