public IHttpActionResult KhachHangTraPhong([FromBody] dynamic dynamic)
        {
            string cmnd = dynamic.CMND.ToString();

            using (NhanVienBusiness nhanVien = new NhanVienBusiness())
            {
                string status = nhanVien.KhachHangTraPhong(cmnd);
                if (status.Equals("ok"))
                {
                    return(Ok("Trả phòng thành công!"));
                }
                else
                {
                    return(BadRequest(status));
                }
            }
        }