It's not 'coming up with a favor'. You're genuinely asking someone for help that they can provide. This one is more challenging with strangers, but with friends and newer relationships where you know the people better, asking them for help is a big deal. I think too many of us don't want to bother people, but it turns out people generally want to help others around them. As Simon Sinek says, don't take away your friend's ability to help you - it's selfish!