Your message is clear and conveys your request effectively. However, I have made a few minor adjustments to enhance the formality and clarity. Here’s a revised version:
Subject: Request for Excusal from Field Visit
Good morning, Sir,
I hope this message finds you well. I would like to request permission to be excused from the field visit scheduled for September 30th and October 1st. I am currently experiencing discomfort due to my period, and it would be challenging for me to participate fully in the activities.
Thank you for considering my request.
Best regards,
Rebecca Yaribizi
Feel free to use this version or keep your original with minor adjustments!