user: Question: Name the minister for end date of 31 July 2004
Columns: ['Minister', 'Party', 'Start date', 'End date', 'Prime Minister']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Antoine Wehenkel', 'LSAP', '15 July 1964', '6 February 1969', 'Pierre Werner']
SQL:

assistant: SELECT "Minister" FROM "Table" WHERE "End date" = '31 July 2004';