select
    t1.line_id as LINE, t1.seat_no as SEAT_F, t3.seat_no as SEAT_T

from SEAT_RESERVE as t1
join SEAT_RESERVE as t2 on t1.line_id = t2.line_id and t2.seat_no = t1.seat_no + 1
join SEAT_RESERVE as t3 on t1.line_id = t3.line_id and t3.seat_no = t1.seat_no + 2
where t1.rsv_status = 0 and t2.rsv_status = 0 and t3.rsv_status = 0
order by t1.line_id desc, t1.seat_no;