The leader said he was busy. How should I reply?

This situation can be answered as follows:

I understand that leadership is really busy. If necessary, you can wait for the right time to communicate.

Through this answer, I expressed my understanding of the busy work to the leader and expressed my willingness to cooperate with the arrangement. This kind of answer can show respect and cooperation and help to maintain a good working relationship.

You can also express your concerns to the leaders and let them know their attitudes and ideas, so as to better communicate and cooperate with them.