CREATE TABLE table_31388 ("Season" CLOB, "Season premiere" CLOB, "Season finale" CLOB, "TV season" CLOB, "Ranking" CLOB, "Viewers  ( in millions ) " CLOB)

What season was the finale that aired on May 23, 2004?
SELECT "TV season" FROM table_31388 WHERE "Season finale" = 'May 23, 2004'
SELECT "TV season" FROM "table_31388" WHERE "Season finale" = 'May 23, 2004'