Subject: Submission Format Inquiry
Good afternoon, Professor,
I hope this message finds you well. I apologize for reaching out on a Sunday, but I wanted to inform you that I submitted the laboratory assignment in PDF format. Unfortunately, I encountered difficulties with Microsoft Word that prevented me from properly illustrating my example. I hope this alternative format is acceptable.
Thank you very much for your understanding. Wishing you a wonderful remainder of the weekend!
Best regards,
[Your Name]