Dissertation acknowledgments are a good way of showing gratitude to the people who have helped you in writing dissertations. There is no fixed method in this, and you can express your thankfulness in any which way you wish. There are no formats you have to follow, and it is one of the few lines in the presentation that you would make that expresses the gratitude you feel towards the ones who have guided you in writing your dissertation.
There is always a part of you that wants to thank someone who has helped you in any way. This applies to dissertations also. When you write a proposal essay, you write in a way or method taught to you by people you approached for help. Try and remember the very first time you attempted a dissertation. It was a testing time, wasn’t it? Formats were difficult, structuring the dissertation as per standard seemed a very difficult exercise.