Vinicius Vacanti proposes a better way to set up meetings with potential customers, business partners, mentors, and so on.
Rather than putting the onus on the person you want to meet with "I'm pretty free for the next two weeks, let me know what time works for you", take off the cognitive load of deciding when to meet, and propose some concrete times.
In practice, I find this does work very well. Usually, proposing 3 times in the next 2 weeks does the job. One of the main reasons this helps is because it reduces the back and forth to set up a meeting (which saves everyone's time):