Hallo,
I am going through a MBA specializing in Human Resource management.
I'd like assistance in identifying an appropriate topic for my dissertation.

You look through your course curriculum and pick a topic that you feel you can properly address. It could be in conflict management, labor laws, diversity, business ethics, etc.

Here is a help on how to select a topic from Wiki-How: How to Select a Topic for a Management or Human Resource Management Dissertation - wikiHow