I think you have to put something on the table that will interest the other party. It might not be huge, but being able to help back in a way or another will ce

I think you have to put something on the table that will interest the other party. It might not be huge, but being able to help back in a way or another will certainly motivate someone to spend time for you. Also, having a common interest for something, on which you could work together. For example, if you really like some open source project, you could be mentored by a committer (common interest) which will have incentive to help you contribute (help back) to the project.