Here it is:
These are the little joys of life that make life what it is.Dear Sir,
It was indeed a very warm and pleasurable experience for me to visit the Department after almost five years. I was delighted to see you and the talk was as fresh as it was on the day in year 2001 when I had met you in the lab.
A cup of tea brought me the memories and joy and I was reminded of the wonderful people who taught me, helped me and were with me during my academic life at the department.
Dear Sir thank you again for contributing to my academic growth during my stay and I am thankful to the entire department.Was Salaam