user: Question: What is the train number for the train name Island Express with a destination of Kanniyakumari?
Columns: ['Train number', 'Train name', 'Origin', 'Destination', 'Service', 'Route/Via.']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [16724.0, 'Ananthapuri Express', 'Trivandrum', 'Chennai', 'Daily', 'Nagercoil,Madurai,Tiruchi']
SQL:

assistant: SELECT "Train number" FROM "Table" WHERE "Train name" = 'Island Express' AND "Destination" = 'Kanniyakumari';