[Your Name]
[Your Address]
[City, State, Zip Code]
[Email Address]
[Phone Number]
[Date]

[Recipient Name]
[Recipient Title]
[Company Name/School Name]
[Company/School Address]
[City, State, Zip Code]

Dear [Recipient Name],

I am writing to provide a valid reason for my absence from [work/school/event] on [specific date]. Unfortunately, [state the reason for the absence, such as a medical appointment, family emergency, or other urgent matter] required my immediate attention, making it impossible for me to attend.

I have already made arrangements to catch up on any missed work and am fully prepared to resume my responsibilities. Please let me know if there is anything else you need from me to ensure a smooth continuation.

Thank you for your understanding and cooperation.

Sincerely,
[Your Name]