user: Question: Which tournament has Hard as the surface and Apr. 12, 1998 as the date?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the Final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Oct. 2, 1994', 'Mali Lošinj', 'Clay', 'Radka Surova', '6–4, 6–2']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Surface" = 'Hard' AND "Date" = 'Apr. 12, 1998';