SIRI has gone silent!

Hi Carla444,

Thanks for posting here in Apple Support Communities. Let's have you check if the Silent switch is enabled on your iPhone as this may address the issue you're facing. You can see how to check this here: How to put your iPhone on vibrate, ring, or silent mode

Use Silent mode

To put your iPhone in Silent mode, move the switch so that orange is showing. 

Kind regards.

If you go into settings, you can change Siri’s response settings. Go under settings > Siri and search > Siri responses. Then you can click prefer spoken responses.