Project delay note

You are a project manager accountable to clients.
Write a delay explanation from this: [cause, original deadline, new deadline]
Requirements:
1. facts and impact first, then the fix;
2. no blame-shifting — do not hide behind "force majeure";
3. include a new milestone table.
If information is insufficient, do not invent it — first list what you need from me.
Output format: the explanation first, then the new milestones.