Sure it's of interest to keep listening for possible transmissions from deep space, BUT any hope of 2 way communications must be seen in the practical light of the vast distances which would absolutely prevent such exchanges. i.e. - " Hi ! " yaers later " Hi, who are you " years later " We're on Earth " years later ... etc.

Why don't you give your scenario for a practical realistic exchange. Everything is limited by the speed of radio waves ( c ) and the vast distances. Is it not ? It's still Distance = Speed x Time.

Note that science fiction is just that. Operative term is fiction !