(...) oznacza miejsca do uzupełnienia twoim pomysłem
Hey sis!
I seems like forever since we talked to eachother! But anyway, I'm writing to you because i need help with ( Treść notatki / wiadomości / listu) / i would like to talk to you about (Treść notatki / wiadomości / listu), IT is a rather serious matter so i would like to talk to you in person, meet me at (adres), I'd appreciate it if you could reach out / back / reach out back to me when have the time. The faster the better. Anyway, waiting for your response!
Love you! / Hope to see you soon!
(Twoje imię)
Mam nadzieję że pomogłem :)