user: Question: What day did the episode with a production code of 218 originally air?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['27', '2', '"iStage an Intervention"', 'Jonathan Goldstein', 'Karey Dornetto', 'October4,2008', '205', '3.9']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Production code" = '218';