I consider, that you are not right. Let's discuss.

I think, that you are mistaken. I suggest it to discuss. Write to me in PM, we will talk.

I regret, but nothing can be made.

I am sorry, that has interfered... I here recently. But this theme is very close to me. I can help with the answer. Write in PM.

It is interesting. Prompt, where I can read about it?

I think, that you are not right. I am assured. Let's discuss it. Write to me in PM, we will talk.

In my opinion you are mistaken. Write to me in PM, we will communicate.

It seems to me, you were mistaken