user: Question: What was the surface for the game that was played on 12-Apr-2005?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '30-Jun-2003', 'Waco, Georgia , United States', 'Hard', 'Alanna Broderick', 'Kim Niggemeyer Cintia Tortorella', '7-6 (7) 6-2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Date" = '12-Apr-2005';