user: Question: when was the premiere when a 3.3 millions of North American watched the episode whose writer was Rob Wright?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [157.0, 1.0, '"Still Charmed & Kicking"', 'James L. Conway', 'Brad Kern', 'September25,2005', '62015-08-157', '4.2']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (millions)" = '3.3' AND "Written by" = 'Rob Wright';