I am not alone in this. Doctors, accountants, plumbers, computer experts, lawyers and financial advisers all must deal with people shamelessly asking for meetings, free advice or free services or treatment — without remotely acknowledging that these professionals make their living selling that time and expertise. Over the years, dozens of experts have told me about being accosted at parties and on airplanes by strangers who ask for a free consultation under the guise of “conversation.”

Surely you do not want to be the kind of person who antagonizes professionals in this way. So here are some tips to help you avoid becoming a networking parasite.

Make the meeting convenient. Ask for time frames that would work well, and meet at a place that is convenient for them, even if you have to drive across town. If they leave it up to you, give them three options and let them pick the one that works best.

Recently, someone asked me to meet him for coffee, and I told him I could make “just about anything work” on a particular Friday. He responded with, “I like to start my day early, so let’s meet for coffee near your office at 6 a.m.” I wrote back that 6 a.m. was too early, to which he responded, “O.K. Let’s make it 7 a.m.” If you want me to pull out all the stops for you, this is not the way to start.

Buy their coffee or meal. Insist on doing this as a sign of how valuable you consider their time and advice. If you are on a tight budget, ask them to coffee, but insist on paying for it by saying, “This is a huge favor to me, so please let me do this small thing for you.” If you can manage it financially, try to meet for drinks or dinner after work. You will get more of their attention if you are not sandwiched in during their day.