Greetings carley284,
Welcome to Apple Support Communities. Does Siri respond to the "Hey Siri" command? If not, follow the steps in the Apple Support article to help with that: If "Hey Siri" isn't working on your iPhone - Apple Support
If Siri stops responding
1.Go to Settings.
2.Tap Siri & Search.
3.Tap Siri Responses.
4.Tap Prefer Spoken Responses to hear Siri speak responses, even when Silent mode is turned on.
If the issue persists, try changing the Siri Language you are using in Settings > Siri & Search > Language. After downloading the new language, test to see if Siri/Dictation is working. You can then switch back to your original/desired language.
Should this trouble continue, get in touch with Apple Support for additional assistance:
Apple Support
We hope this helps you.