user: Question: What was the original air date of the episode written by Michelle Offen?
Columns: ['Series #', 'Episode #', 'Title', 'Written by', 'Directed by', 'Viewers', 'Original airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'real', 'text']
Sample row: [14.0, 1.0, "The Hero's Standard", 'Michael Miller', 'Peter Andrikidis', 259000.0, '20 April 2011']
SQL:

assistant: SELECT "Original airdate" FROM "Table" WHERE "Written by" = 'Michelle Offen';