Interlocutor is used very rarely in English. No native speaker would use it in a sentence like this. I bet it's similar to what you would say in Russian but a lot of people wouldn't even know what it means. It will be hard to find a native English speaker to speak to on this site. You will find it hard to find a native English speaker to speak to on this site.

I would just like to agree with the previous answer. I have a fairly large vocabulary, but I had to look up the definition for interlocutor. However, I don't think it will be too difficult to find a native English speaker to converse with. :-)