Dear Anna,
How are you hope you are doing well, convey my regards to your family.
I am writing this letter to thank you for your family invitation for the party, First of all, my advance greeting for your special occasion. Unfortunately, I cannot attend the anniversary function next Saturday, due to some unforeseen issue.
I am suffering with fever and got admitted to hospital last Wednesday. This is viral fever and my blood counts are low. I am extremely disappointed for my absence for the occasion, instead I am sending my sister with a small gift from my side.
I hope we can meet when I return from the hospital. I will arrange a dinner for you on the same day, and you can count on me. I am looking forward to meeting your husband as well as your baby.
Once again, Best wishes for your family life, and I eagerly await your response.
Yours
Naathu
