user: Question: When was the Lagos tournament?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['May 31, 2004', 'Tenerife', 'Hard', 'Jaymon Crabb', '4–6, 6–4, 6–4']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Tournament" = 'Lagos';