user: Question: What was the original air date of the episode that had 5.30 million U.S. viewers? 
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [140.0, 1.0, '" My Own Worst Enemy "', 'Bill Lawrence', 'Neil Goldman & Garrett Donovan', 'October25,2007', 701.0, '7.03']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (millions)" = '5.30';