Sir, I have no man ... - The answer of the man implied that he did wish it, but, in addition to all his other trials, he had no “friend” to aid him. This is an additional circumstance that heightened his affliction.
Related Commentaries of John 5:7
John 5:7
7 The impotent man answered him, Sir, I have no man, when the water is troubled, to put me into the pool: but while I am coming, another steppeth down before me.