user: Question: What tournament was held on 21 May 2006?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '21 May 2006', 'Pitești , Romania', 'Clay', 'Amina Rakhim', '7–6(3), 5–7, 6–4']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Date" = '21 May 2006';