We expect your business (or you as a freelancer) to provide a professional, preferably perfect product or service.
But we know that’s not always what we’ll get. You are human. We know that. We know you will make mistakes and forget things that you really should remember. Sometimes you won’t have the answers to our questions.
It’s how you deal with us that matters. Own your mistakes. Apologize where appropriate. Then fix it. Your clients will see a sincere human being on the other end and they will love you for it.