user: Question: On what date did the episode "Petra-Gate" air?
Columns: ['Episode #', 'Title', 'Airdate', 'Rating (Millions)', 'Rank']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot (aka I Am Not Going to Sell Herbalux)"', 'January 5, 2007', '4.89m', '#4']
SQL:

assistant: SELECT "Airdate" FROM "Table" WHERE "Title" = '"Petra-Gate"';