Meeting Dear Mr.Smith: I am messaging you to reassure our meeting on Monday the Fourth. If anything is to happen that makes you unable to attend, please let me know ASAP Veronica Gomez President of The Oreo Company
Notice how this is very proper and the correct format. She professionally emailed him about a meeting happening soon.
Grades Dear Mrs.Thomas: I would like to talk to you about my grade whenever you have time. Sarah Penny Student in English Block 1
Notice how Sarah politely asked her teacher to have a conversation about her grade