Hi Drew,
This is my very first time to write a letter in English. If I make any grammar error please forgive me.
I need to apologize for making a mistake by saying a wrong date to you last time. I am really sorry for that. After checking the calender, I can now says that I am free on next weekend, either 17th or 18th March, morning time.
So, if you are free at that time, what says we go bowling together with your family?
Hope to hear from you soon.
Your sincerely,
Jack