Dear Mr Thompson, I hope that you are doing well. I am writing to apologise for the inconvenience caused by the party held at our residence last Saturday night.
Dear Mr Albert, Hope you are doing great. I am writing in response to the complaint letter I received from you yesterday regarding the noise from my flat.
Dear Mr and Mrs Martin, Hope you are doing great. I am extremely surprised to get a letter from you indicating that you are immensely annoyed by the loud sound created in my house.
Dear Mr & Mrs Johnson, I am writing in response to your complaint letter about the noise from my apartment. I feel that I have to explain myself and humbly ask for your forgiveness.
Dear Mr and Mrs Smith, Earlier today, I received your complaint letter regarding the loud commotions from my flat. It is a real shame that you had to suffer due to my oversight.
Dear Mrs. Martha, I hope this letter finds you well.
Dear Mrs Barbara, I am very shocked to learn from your letter that the noise from my flat has been a source of disturbance for you and it has been spoiling your evening and causing distress. I am utterly regretful about that.
Dear Mr and Mrs Williams, I hope you are doing great. It is a shame that we do not know each other very well and I would like to apologise for that.