public String[] confirmReservation(String start_day){
		String query = "select room_number from reservation where start_day<='"+start_day+"' and start_day+period>='"+start_day+"'";
		Object[][] data = helper.executeSelectQuery(query);
		String[] result = null;
		if(data.length>0){
			result = new String[data.length];
			for(int i=0;i<data.length;i++){
				for(int j=0;j<data[i].length;j++){
					result[i] = data[i][j].toString();
				}
			}
		}
//		if(result != null){
//			for(int i=0;i<result.length;i++){
//				System.out.println(result[i]);
//			}
//		}
		return result;
	}