user: Question: Tell me the left office for Mirko Tremaglia
Columns: ['Portfolio', 'Minister', 'Took office', 'Left office', 'Party']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Minister European Affairs', 'Giorgio La Malfa', '23 April 2005', '17 May 2006', 'Republican Party']
SQL:

assistant: SELECT "Left office" FROM "Table" WHERE "Minister" = 'Mirko Tremaglia';