Which time slot did the season finale on May 18, 2004 hold?
CREATE TABLE "u_s_television_ratings" (
  "season" real,
  "episodes" real,
  "timeslot_est" text,
  "season_premiere" text,
  "season_finale" text,
  "tv_season" text,
  "ranking" text,
  "viewers_in_millions" text
);
SELECT "timeslot_est" FROM "u_s_television_ratings" WHERE "season_finale"='May 18, 2004';