Account for the relationship as it is now
Use a tone that fits the present relationship, not the closeness, authority, or access that existed in the past. For a message about how to follow up on an overdue client decision, use this factual base: summarize the deliverable, version, requested input, owner, and effect on the schedule.
Ask without assigning an obligation
Explain what you hope for while making decline, delay, or a different format genuinely acceptable. Give a small set of options and explain which default plan applies if the real deadline passes. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Keep the ending honest
Do not bury a scope or price change, threaten the relationship, or pretend silence means approval. Use the contract and documented escalation route for legal, payment, privacy, or security decisions. Avoid future promises, guilt, flattery, or nostalgia that imply the recipient owes you access.