user: Question: On which date did the tournament final with the Clay surface take place?
Columns: ['Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['23 July 2003', 'Indianapolis, United States', 'Hard', 'Andy Ram', 'Diego Ayala & Robby Ginepri', '2–6, 7–6(3), 7–5']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Surface" = 'Clay';