Write an email with the subject line "Keegan Farrell - Out of the Office tomorrow morning".
Good Afternoon All, FYI, I will be out of the office to attend a doctor's appointment tomorrow morning at 9am. I will be having some blood work done so I am unsure as to the exact time that I will arrive at the office, but I will be returning immediately after the appointment . Please leave me a note, voicemail or email in my absence and I will respond promptly upon receipt. Thank you!