Dear XXX,
How are you?It has been a long time since we last contacted each other.
How are you doing in University?Is it stressful?Mine is great.I feel more relaxed and we have more freedom now.
Next month,we will be holding a New Year celebration,which will also be our class reunion.I really hope that you will be able to attend.It will be a great chance for us to catch up with one another and I believe we will have a great time.
I will be anticipating you reply!Hope to see you soon.
Yours sincerely,
XXX