private void btnNext_Click(object sender, EventArgs e)
        {
            HelperStaticClass.guests = GetGuestsFromForm();
            bool tempBool = true;

            foreach (Guest guest in HelperStaticClass.guests)
            {
                bool result = guestController.GuestControll(guest);

                if (!result)
                {
                    MessageBox.Show("Error while adding guests!");
                    tempBool = false;
                    HelperStaticClass.guests.Clear();
                    HelperStaticClass.guestsDictionery.Clear();
                    break;
                }
            }

            if (tempBool)
            {
                decimal price = ReservationPriceCalculator(HelperStaticClass.reservationStatic);
                HelperStaticClass.reservationStatic.TotalPrice = price;
                FinalReservationScreenOpen();
            }
        }