Rebuild the missing context
Assume the recipient will not remember every date, promise, or earlier conversation. For a message about how to reconnect with a childhood teammate, use this factual base: introduce yourself with one shared place, activity, person, or time period they can recognize.
Say what needs to happen next
State the decision, information, or practical action you need and include a real deadline only when one exists. Offer a low-pressure way to confirm the connection and share a brief reason for reaching out. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Avoid making urgency into pressure
Do not assume old closeness, demand memories, or ask for personal details before they verify who you are. Respect privacy, identity uncertainty, and any refusal, and avoid contacting a minor without a guardian-appropriate route. Do not make the other person responsible for reducing the discomfort that prompted you to write.