Dear Sally:
How are you,we are really have long time no see!i know you are busy these days.so i give you a chance to relax.
Sincerely to invite you to have a dinner in my house on 25th November,and there will held a party after dinner.I hope you can accept my invitation
I'm really looking forward to seeing you soon,and should you have any questions,please feel free to inform me.
yours
XXX