Dear Sujon,
Your letter is just to hand. From the letter, I came to know everything. I am very glad to know that you are going to arrange a picnic on the 15th instant. I know it will be a day of much pleasure. I was really interested in joining it. You know that I never miss a chance like this.
But I am unlucky enough as I cannot attend it. I have an important interview on that day. Therefore, it is quite impossible on my part to join you. Please do not take otherwise. I shall see you as soon as possible. Best wishes to you and love to the younger ones.
Yours ever,
______(your name)
