user: Question: when did the USL A-League have Conference Finals?
Columns: ['Year', 'Division', 'League', 'Reg. Season', 'Playoffs', 'Open Cup']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1998', '2', 'USISL A-League', '1st, Pacific', 'Conference Finals', 'Did not qualify']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "League" = 'USL A-League' AND "Playoffs" = 'Conference Finals';