user: Question: What was the Original Canadian air-date for the episode directed by Mark Rydell?
Columns: ['Title', 'Original story author', 'Director', 'Original U.S. air-date', 'Original Canadian air-date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['" A Clean Escape "', 'John Kessel', 'Mark Rydell', 'August 4, 2007', 'November 11, 2007']
SQL:

assistant: SELECT "Original Canadian air-date" FROM "Table" WHERE "Director" = 'Mark Rydell';