Hi thanks for your approach to us.  Some of time in our life we tend to remember most of the conversation or incidence. But after some period, due to various responsibility we tend to prioritize our things, in which we may not be able to remember. It doesn't mean there is some problem, but it depends on the importance we give for that particular work/ talk/situation. That's normal in most of us life. You can visit psychologist for assessment and guidance. Take care. Stay positive.