user: Question: Which episode aired in the USA on 20 May 2005?
Columns: ['Episode', 'Title', 'Airdate (Canada)', 'Airdate (USA)', 'CBS airdate']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [53.0, '"Lucky Break"', '18 April 2003', '12 March 2004', '16 September 2006']
SQL:

assistant: SELECT "Episode" FROM "Table" WHERE "Airdate (USA)" = '20 May 2005';