protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                DataTable dtPassengers = new DataTable();

                CancelTicketClass cancelClass = new CancelTicketClass();

                dtPassengers = cancelClass.GetPassengers(Session["selectedBookingId"].ToString());

                GridView1.DataSource = dtPassengers;
                GridView1.DataBind();
            }
        }