Answer:
dear principle,
i am here to say that i will be absent for the 3rd of january, 2022. the reason being for my elder sisters wedding. this is an important day because my elder sister watches over me and is always there for me, thus i should be there for her wedding. So i was just letting you know that i will be absent all day today and that i will be going to my elder sisters wedding.
-thank you for understanding and have a good day-
-your name-