private void buttonDelete_Click(object sender, EventArgs e)
{
buttonDelete.Visible = false;
label4.Visible = false;
label6.Visible = false;
label1.Text = "Succesful!";
label2.Text = $"Your tickets were removed";
pictureBox1.Visible = true;
festivalHandler.RemoveCustomer(CancelBookingForm.customer);
}