People commonly make the mistake of approaching busy, powerful leaders with a problem instead of a solution. This is a waste of an opportunity.
If you get time to talk to your large corporation's CEO or your agency’s secretary about a problem, bring them a solution that is trivial to implement: “sign this form," “send this email to this person,” "say these words at this meeting."
They are interested in your problem, but they don't have time for it. Give them something easy to say “yes” to.