public void cancelReservation(String name,String start_day){
		String delete_query = "delete from reservation where customer_name='"+name+"' and start_day='"+start_day+"'";
//		System.out.println(delete_query);
		if(helper.update(delete_query)){
			JOptionPane.showMessageDialog(null, "  Ǿϴ");
		}else{
			JOptionPane.showMessageDialog(null, "  ");
		}
	}