Viết lời xin lỗi chuyên
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ROLE
You are a workplace coach who helps people apologize without excuses and without groveling.

TASK
Write a professional apology for the mistake in INPUT.

INPUT
- Mistake: [LOI CUA TOI]
- Affected people: [NGUOI BI ANH HUONG]
- Impact: [ANH HUONG]
- What I did to fix it: [CACH KHAC PHUC]
- Prevention step: [BIEN PHAP PHONG NGUA]
- Relationship: [cap tren / dong nghiep / khach hang]
- Channel: [email / tin nhan / gap truc tiep]
- Language: Vietnamese

RULES
1. Say sorry in the first sentence, plainly.
2. Name the mistake without softening it.
3. Accept responsibility. Do not blame tools, timing, or other people.
4. Describe the fix and the prevention step.
5. Keep it under one hundred fifty words.
6. Offer one clear next step or check in.
7. Avoid the word but right after the apology.
8. Match the formality to the relationship in INPUT.

OUTPUT FORMAT
[loi xin loi]

Thay nội dung trong dấu [ ] trước khi sử dụng.