How do I ask for an informational chat? (Boston)

I sent 3 messages on a professional network and got two replies. I do not usually post, so bear with me. I want advice, not a job directly.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

I wrote three short lines: who I am, why them and a small ask for fifteen minutes. About one in four said yes.