u/Fickle-Area-7904

Had a accident in the morning today,
I was driving on the main road and the person B was joining the main road.
I believe person B joined the main road and attempted to change the lane at the same time.
Attached reference image.

Later person B went ahead and tried to find a place to stop, I followed and I waived to stop ahead to the nearest empty parking. Person B did not stop went away.

Need advice what to do in this case?

For my car it scratched the right fender and Tyre rim. For person B it had hit the left front door.