Hello there :-) We are a professional studio. One of our services is audio restoration. We do a lot of restoration, however, it's not possible to be sure if it's doable, as long I don't hear a sample of the audio. It always depends on the background noise/sounds, so if you can provide me a sample of the audio, I can return you a processed version, so you can hear how much it will be enhanced/restorated.
Kind regards,
Stefan