WITH SEAT_SEQUENCE AS (
    SELECT 
        LINE_ID,
        SEAT_NO,
        RSV_STATUS,
        LAG(RSV_STATUS, 1) OVER (PARTITION BY LINE_ID ORDER BY SEAT_NO) AS PREV_RSV_STATUS,
        LAG(RSV_STATUS, 2) OVER (PARTITION BY LINE_ID ORDER BY SEAT_NO) AS PREV2_RSV_STATUS
    FROM 
        SEAT_RESERVE
)
SELECT 
    LINE_ID AS LINE,
    SEAT_NO - 2 AS SEAT_F,
    SEAT_NO AS SEAT_T
FROM 
    SEAT_SEQUENCE
WHERE 
    RSV_STATUS = '0' 
    AND PREV_RSV_STATUS = '0'
    AND PREV2_RSV_STATUS = '0'
ORDER BY 
    LINE_ID DESC,
    SEAT_F ASC