user: Question: When the skip is Glenn Howard, what the minimum PF?
Columns: ['Province', 'Skip', 'W', 'L', 'PF', 'PA', 'Ends Won', 'Ends Lost', 'Blank Ends', 'Stolen Ends', 'Shot Pct.']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Alberta', 'Kevin Martin', 6.0, 1.0, 52.0, 38.0, 32.0, 27.0, 5.0, 7.0, 87.0]
SQL:

assistant: SELECT MIN("PF") FROM "Table" WHERE "Skip" = 'Glenn Howard';