user: Question: Which Country has a Change (08/07) of unknown, and a 2008 larger than 1102497, and a City of Luanda?
Columns: ['Country', 'Airport', 'City', '2008', 'Change (08/07)']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['South Africa', 'OR Tambo International Airport', 'Johannesburg', 18501628.0, '0 4.3%']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Change (08/07)" = 'unknown' AND "2008" > 1102497.0 AND "City" = 'Luanda';