Because having a chat with you was special and I want to remember it but my aging fallible human brain is going to forget it, so I'd like to be able to remember it and hold on to and cherish that moment we shared.
if chats are so important to you, write it down, with your hand. journaling is fun and great and there's evidence that it's good for your mental health because it allows you intentional time for introspection and insight-building
If you can't be bothered, it wasn't that meaningful or important.