Always plan your day so that you have enough time to spend explaining your business and how it operates with your new client.
Find out if they are from the area.
Ask what kind of things interest them so you are better able to advise them on your products in the future.
Go through their current purchases with them before they leave so they understand what you have done.
Politely wait for them to leave first and then calmly follow unless they are remaining in the area and then you can dismiss yourself.
Follow up on your intial meeting to make sure everything was to their satisfaction.
Make absolutely, completely and utterly certain that you HAVE NOT OVERCHARGED THEM.
I am farming sheep and goats on the Dordogne/Gironde border with my husband and our 3 children. We have an on farm butchery and sell our meat direct to the public via the markets and delivery points in our local area