Why is there no delay in communication between humans and Trisolarans?

How can two galaxies communicate when they are 4 years apart? Are you really communicating like that idiot in the sci-fi world who spends his life saying I love you? Obviously, this is impossible. Interstellar communication! The genius Comrade Asimov solved this problem. According to everyone's understanding, does it take eight years for everyone to talk to each other once? You ask and I answer, in the past 40 years, we have only spoken to each other 4/5 times at most? How is it possible? It's just a joke to ask Trisolarans questions like this, and then we won't be able to communicate more than once. In fact, those who ask questions keep asking, and those who answer keep answering (Second Red Coast keeps transmitting and receiving at the same time), which can ensure that everyone is communicating all the time. It just takes eight years for both parties to change the topic:) But the amount of information exchanged N times bigger.