user: Question: What was the air date of the episode that has an 18-49 of 2.2/7?
Columns: ['Episode', 'Air Date', 'Timeslot', '18-49', 'Viewers']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Gary Has a Dream', 'September 23, 2009', 'Wednesday 8:30 pm', '2.4/7', 7.37]
SQL:

assistant: SELECT "Air Date" FROM "Table" WHERE "18-49" = '2.2/7';