user: Question: What is the date of return for the program for the program "Big Brother"?
Columns: ['Programme', 'Date(s) of original removal', 'Original channel(s)', 'Date of return', 'New channel(s)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Celebrity Big Brother', '27 January 2010', 'Channel 4', '18 August 2011', 'Channel 5']
SQL:

assistant: SELECT "Date of return" FROM "Table" WHERE "Programme" = 'Big Brother';