user: Question: What dat did "The Changeling" originally air?
Columns: ['No. overall', 'No. for series', 'Title', 'Directed by', 'Written by', 'Original air date', 'UK viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [27.0, 1.0, '"The Tears of Uther Pendragon (Part 1)"', 'Jeremy Webb', 'Julian Jones', '11September2010', '6.49']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Title" = '"The Changeling"';