user: Question: What date was the match where Daniel Gimeno-Traver's partner was Pere Riba?
Columns: ['Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['15 August 2005', 'Cordenons , Italy', 'Clay', 'Melle van Gemerden', 'Daniel Köllerer Oliver Marach', 'WEA (no winner)']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Partner" = 'Pere Riba';