What do I message to a person whom I like..... to start a meaningful conversation (without showing that I'm interested in him)

I want to start a meaningful conversation with a boy whom I like but I don’t want to show.. that I like him or am interested in him. I just can’t start it like, ‘hi’ or ‘hey’.. There must be a topic… Please suggest some messages..
Here is a brief description bout him.. So, you know his interests and advice accordingly
– he feeds stray dogs
– he is kind
– he is intelligent

I don’t know much about him.. He comes at my tuition
please suggest