How many tickets were available at Halle Tony Garnier on June 15, 2009?
CREATE TABLE "tour_dates" (
  "date" text,
  "city" text,
  "country" text,
  "venue" text,
  "tickets_available_since" text,
  "attendance" real,
  "comment" text
);
SELECT "tickets_available_since" FROM "tour_dates" WHERE "venue"='halle tony garnier' AND "date"='june 15, 2009';