user: Question: Name the start date with party of PD
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 "Start date" FROM "Table" WHERE "Party" = 'PD';