Just dropped in. Workers everywhere. Many many tables open. Told there was a 20 minute wait

Maybe the tables open didn't have a server to cover that section

I was at flying j and waiters was fast friendly

I hope you called back and spoke with management. They are usually fairly responsive. Not a great place don't get me wrong, but that seems unusual to me.

So do you have a question? Denny's is a popular place at certain times and can often have a wait. We always get good service at this location and food is good.