user: Question: Which surface was played during Curitiba tournament?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['5 September 2005', 'Bagneres-De-Bigorre', 'Hard', 'Philipp Hammer', '7–6 6 , 7–5']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Tournament" = 'Curitiba';