user: Question: What was the Termination of Mission date for the ambassador who was appointed by Barack Obama?
Columns: ['Representative', 'Title', 'Presentation of Credentials', 'Termination of Mission', 'Appointed by']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Robert L. Flanagin', "Chargé d'Affaires ad interim", 'Nov 25, 1975', 'Mar 25, 1976', 'Gerald Ford']
SQL:

assistant: SELECT "Termination of Mission" FROM "Table" WHERE "Appointed by" = 'Barack Obama';