human
Write a professional email to my boss, Sarah, saying I won't make the meeting at 3 pm today and need to reschedule. 
gpt
Good afternoon Sarah,

I'm sorry but unfortunately, I won't be able to attend our 3 pm meeting today due to prior obligations. I'm hoping we can reschedule. Please let me know another day and time that works for you. Again, I apologize for the inconvenience. 

Regards,
(Your Name)