I don't use context, as that would leave me with a very long list of contexts. Instead, I use the a context called ?Waiting For and I use the person's name in my note, with a hashtag. Well, actually I use a query tag, (eg: ?Stephane English). Now it's easy to search my list or filter it for all actions with the word ?Stephane in it. When I'm talking to someone, I filter my list for ?<their name> and I can quickly see what other topics I should be checking up with them. I find it a quick and powerful way to keep on top of actions for which I'm expecting something from someone else.
Hope that helps.
Stéphane