I would begin with the wording in the difficulty line including "Just FYI" or "Just checking in." Then, start your message with "Hi, how have you ever been?"
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Depending on what you are reminding the character approximately, nation it in brief and with a friendly tone. "Just wanted to remind you (or ask) approximately the data we mentioned a few weeks in the past. Were you able to find it for me?"
If it's a fee owed, then some thing like "Just checking to look once I may anticipate the charge for my work...." Don't go on and on about how badly you want it. Don't berate the recipient by means of pronouncing things like "It's been three weeks and this changed into promised long earlier than that..."
Watch the wording carefully because e-mail has no tone and words can be misconstrued. Read it out loud earlier than you ship and hear it on your thoughts. How might you feel if you obtained it?