Siri not working

Siri is not available on AirPort.

Siri needs Internet connection and is not available everywhere.

Where are you using Siri?

Here you may find some useful information Use Siri on your iPhone, iPad, or iPod touch - Apple Support

If it does't help you can also reset your device. This won't delete your data stored on this device.

• Press and hold the Sleep/Wake button
• Press and hold on the Home button
• Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings