public boolean confirmReservation(String name,String start_day,int period){
		boolean result = false;
		String already_reservation_query = "select * from reservation where customer_name='"+name+"' and ((start_day<='"+start_day+"' and start_day+period>='"+start_day+"')or('"+start_day+"'<=start_day and '"+start_day+"'>=start_day"+"-"+period+"))";
//		System.out.println(already_reservation_query);
		Object data[][] = helper.executeSelectQuery(already_reservation_query);
//		System.out.println(result[0][1].toString());
		if(data.length>0){
			//
//			String delete_query = "delete from reservation where customer_name='"+name+"' and start_day='"+start_day+"'";
			JOptionPane.showMessageDialog(null, "  ҵ˴ϴ");
//			helper.update(delete_query);
			cancelReservation(name, start_day);
			result = true;
		}
		return result;
	}