Unable to update my MacBook Air

We're not sure what is happening either because you've given us no usable details.

What year MacBook Air do you have?

What macOS version is installed now?

Are you trying to update the current OS or upgrade to the next major OS?

What happens when you try?

Details matter.

Your tag line says that you are running Monterey. Only those MacBook Airs with hardware model years of 2018 or later can run anything higher than Monterey.