user: Question: What was the start date for the party of LSAP with a Prime Minister of Jean-Claude Juncker?
Columns: ['Minister', 'Party', 'Start date', 'End date', 'Prime Minister']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Eugène Schaus', 'DP', '6 February 1969', '15 June 1974', 'Pierre Werner']
SQL:

assistant: SELECT "Start date" FROM "Table" WHERE "Party" = 'LSAP' AND "Prime Minister" = 'Jean-Claude Juncker';