Sure, here's a sample email:

Subject: Unable to Attend Meeting

Dear [Meeting Organizer],

I'm writing to let you know that I will be unable to attend the meeting scheduled for [date and time]. Unfortunately, due to unforeseen circumstances, I'm unable to make it.

I apologize for any inconvenience this may cause and understand that my absence may affect the agenda. Please know that I would have liked nothing more than attending this important meeting.

If there is any way in which I can contribute or provide input before or after the meeting, please do not hesitate to reach out. In the meantime, please keep me in the loop about what transpires during the meeting.

Thank you for your understanding and sorry again for missing out on this important gathering.

Best regards,
[Your Name]
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