How to change the volume of Siri on my iPhone?

Thanks for trying that and getting back to us, dobiewonderland. It's appreciated.

We have some questions for you at this point:

• Since we're not quite understanding your statement that "Siri sets the volume", how is Siri setting the volume for you?
• If you go to Settings > Sounds & Haptics, what level is the Ringer and Alerts set before you invoke Siri?
• Are you raising the volume with the Volume Up Button after Siri has responded, or before?
• Are other sounds lower than expected besides Siri?

Once we have a better understanding of the issue with the answers you provide, we'll do our best to find a resolution.

Take care.

Hey dobiewonderland,

It appears that you're having a problem using Siri on your iPhone. The voice is too quiet, and you're unable to adjust it using the volume buttons. We're glad to glad to provide assistance.

Adjust the volume on iPhone - Apple Support -- Go to Settings > Sounds & Haptics and make sure that Change with Buttons is turned on. 

Feel free to get back to us with any questions or problems you may have.

All the best.