Start with the part that is verifiable
Separate the event you can describe from the motive or reaction you are guessing. For a message about how to reconnect with a former consultant, use this factual base: remind the person where you worked together, when, and what current topic makes the contact relevant.
Make one answerable request
Give the recipient one concrete question or next step instead of several emotional jobs at once. Make one modest request and give enough information for them to decline or redirect it. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Leave the recipient in control
Do not imply endorsement, exploit a former hierarchy, or send confidential material from the old relationship. Use official business, privacy, conflict, and procurement rules when commercial or regulated information is involved. A clear message remains useful even when the answer is no or no answer arrives.