user: Question: Which round happened on 10 April 2007?
Columns: ['Date', 'Round', 'Opponents', 'H / A', 'Result F–A', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['20 February 2007', 'First knockout round First leg', 'Lille', 'A', '1–0', 41000.0]
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Date" = '10 April 2007';