What is the Original Canadian air-date that was directed by Michael Tolkin?
CREATE TABLE "episodes" (
  "title" text,
  "original_story_author" text,
  "director" text,
  "original_u_s_air_date" text,
  "original_canadian_air_date" text
);
SELECT "original_canadian_air_date" FROM "episodes" WHERE "director"='michael tolkin';