Which timeslot did episode no. 15 hold?
CREATE TABLE "season_1" (
  "no" real,
  "episode" text,
  "air_date" text,
  "timeslot" text,
  "rating" text,
  "share" real,
  "18_49_rating_share" text,
  "viewers_m" text,
  "rank_num" text
);
SELECT "timeslot" FROM "season_1" WHERE "no"=15;