Dear Mrs.Jones：
Sorry to brother，i am Jim Jackson from the Heat company.I’m sorry for the trouble and inconvenience caused to you due to my fault.According to our contact, I should have helped you install the central heating system yesterday.But I couldn’t install it on time because I remembered the wrong date. I apologize again for my oversight.In order to compensate, I promise to work on overtime to insall it for you before the end of the working day.If you agree with my remedial measures, you can communicate with me by email at any time.
Sorry for the inconvenience to your life.
Best woshes
Jim Jackson