user: Question: What is the Date with an Opponent that is Flavia Pennetta?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'April 12, 2009', 'Andalucia Tennis Experience , Marbella, Spain', 'Clay', 'Jelena Janković', '3–6, 6–3, 3–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Flavia Pennetta';