user: Question: What is the original air date of the episode directed by Ian Barry and written by Philip Dalkin?
Columns: ['Series episode', 'Season episode', 'Title', 'Directed by', 'Written by', 'Original air date', 'Viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [27.0, 1.0, '"Catch and Release"', 'Ian Barry', 'Adam H Todd', '18May2009', '1.33']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Directed by" = 'Ian Barry' AND "Written by" = 'Philip Dalkin';