user: Question: Name the original airdate for Robin Mukherjee and Margy Kinmonth
Columns: ['Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series.', 'Series No.', 'Episode', 'Director', 'Writer', 'Original airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [66.0, 1.0, '"Humpty Dumpty"', 'Jim Hill', 'Ginnie Hole', '6September1991']
SQL:

assistant: SELECT "Original airdate" FROM "Table" WHERE "Writer" = 'Robin Mukherjee' AND "Director" = 'Margy Kinmonth';