user: Question: For the tournament played on 26 February 2006, what surface was used?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '30 August 1998', 'Boston , USA', 'Hard', 'Jack Waite', 'Jacco Eltingh Paul Haarhuis', '3–6, 2–6']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Date" = '26 February 2006';