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 ask a neighbor to water your plants, use this factual base: state the item, task, route, date, duration, responsibility, and any expense or risk involved.
Ask without assigning an obligation
Explain what you hope for while making decline, delay, or a different format genuinely acceptable. Make a direct request, offer the information needed to decide, and confirm the return or completion plan. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Keep the ending honest
Do not call the favor small when it costs time, money, access, or professional reputation. Do not ask someone to break a rule, share credentials, sign falsely, transport unsafe items, or assume legal responsibility unknowingly. Avoid future promises, guilt, flattery, or nostalgia that imply the recipient owes you access.