user: Question: What is Surface, when Date is 2 May 1999?
Columns: ['Outcome', 'Date', 'Location', 'Surface', 'Opponent in final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '2 May 1999', 'Coatzacoalcos , Mexico', 'Hard', 'Candice Jairala', '3–6 6–3 7–5']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Date" = '2 May 1999';