It got so bad I couldn't carry on a normal conversation.

At times he could take part in normal conversation as though nothing was wrong.

God knew when they'd get a chance to have a normal conversation with anyone here again.

The tone was probably no different than that of a normal conversation.

Her voice was just a little too high for normal conversation.

You should be able to carry on a normal conversation while working out.

It became impossible to hold a normal conversation with him.

I'm already so far away that it's impossible to hold a normal conversation with her.

And what other hip, popular place has a sound level low enough for normal conversation?

This, surely, is much more like what we really would say in a normal conversation.