Automated message to chase user when call status is awaiting user response

This was a feature that I found very useful at my previous job. It chases up the user and a few times and if they still don't respond then the call gets closed. A lot of users seem to just create requests and if the issue resolves itself then they don't respond.

I had a look at notifications but there doesn't seem to be anything that fits the criteria. I guess that I should mention that we have version 9.0 build 9003.

Also, it would be very useful if the request automatically changed status to open when users respond.

Thanks,

James