user: Question: What is the expiring term for Daryl Hecht when the appointing governor is Tom Vilsack?
Columns: ['Name', 'Appointed/Elected', 'Term expires', 'Appointing Governor', "Governor's Party Affiliation"]
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Chief Justice Mark Cady', '1998', 'December 31, 2016', 'Terry Branstad', 'Republican']
SQL:

assistant: SELECT "Term expires" FROM "Table" WHERE "Appointing Governor" = 'Tom Vilsack' AND "Name" = 'Daryl Hecht';