Dear Mr.Johnson
I write this email to apologize you about the task that I had promise to help you on this weekend.The task about painting your outside wall.My boss decide to celebrate his success for highest sales of the year at Helesa Hotel on this saturday so I will not have my free time to help you on this weekend.But I will ask my liltle brother if he free on that day I will ask him for help.
If you need some help in the future no matter what the situation is.I will assist you all of my heart.
Best regards
Manila
