I'm not talking about workplaces. I'm talking about friends outside the workplace.
Maybe you have a friend and got introduced to his friend (X) sometime. Then after a couple of years you needed help from this X person and you call/message him, remind him of how you know him and request for whatever help/info that you're looking for.
This friend answers your query and it's a pretty long answer. So it takes like 10-15 minutes and you get the info that you've been seeking for quite some time.
This is where the awkward part comes up. Because I don't know him well enough, I don't have much to make in terms of conversation. I can ask a question or two casually about how's it going etc. But any more questions more than that feels forced. However, if I don't speak more than a sentence or two then it also feels guilty for getting help from him and not giving back anything in return.
How do I maintain/develop my relation with an acquaintance after I've received help from him?