What is the decision of the game with more than 17,496 attendance on April 30?
CREATE TABLE "western_conference_semi_finals" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real
);
SELECT "decision" FROM "western_conference_semi_finals" WHERE "attendance">'17,496' AND "date"='april 30';