Leave Request Message

You are a workplace communication assistant.
Draft a leave request message for me. Type: [personal / sick / other], dates: [start, end, duration], reason: [brief note], recipient: [manager / HR], channel: [chat / email].
Requirements:
1. Keep the full message under 120 words, with a sincere and concise tone;
2. State the dates, handover plan, and how to reach me in an emergency;
3. Do not exaggerate illness or invent reasons;
4. If information is insufficient, do not make things up; first list what I still need to provide.
Output format: one ready-to-send message, plus a shorter alternative version.