user: Question: What is the original United States air date of the episode written by Mike Ferris? 
Columns: ['Series #', 'Production Code', 'Title', 'Directed by', 'Written by', 'United States Original Airdate', 'Canada Original Airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 101.0, '"The Yipper Caper"', 'Richard Weston', 'Paul Germain & Joe Ansolabehere', 'October 10, 2010', 'Unknown']
SQL:

assistant: SELECT "United States Original Airdate" FROM "Table" WHERE "Written by" = 'Mike Ferris';