We may call upon angelic presences to help us offer healing to someone in great pain or need. But often then we block their help by getting too willful. When we say we want such and such a result; we want their cancer removed, want their marriage issues resolved, we are coming from ego. We cannot know what the root problem is, or what results might constitute true and deepest healing.
Just wish them the best from a clear space within your soul, then get out of the way.
You do need to focus, to project with clear intent; but you cannot kill out their karma and wrestle what you want for them out of the inevitable.
– Another point: We call upon angels to help us when we are determined to help other humans or animals. But how often do we ask angels if there is any way we can help them?