user: Question: How many episodes originally aired on April 29, 2008?
Columns: ['No. in series', 'No. in 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: [184.0, 1.0, '"Alternate"', 'David Platt', 'Neal Baer & Dawn DeNoon', 'September 25, 2007', 9003.0, '12.10']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "Original air date" = 'April 29, 2008';