ALBUS
Dad? Why are we here?

HARRY
This is where I often come.

ALBUS
But this is a graveyard...

HARRY
And here is Cedric’s grave...

ALBUS
Dad?

HARRY
The boy who was killed – Craig Bowker – how well did you know him?

ALBUS
Not well enough.

HARRY
I didn’t know Cedric well enough either. He could have played Quidditch for England. Or been a brilliant Auror. He could have been anything. And Amos is right – he was stolen. So I come here. Just to say sorry. When I can.

ALBUS
That’s a – good thing to do.

Harry Potter and the Cursed Child - Chapter 4 :
See this quote in the Pensive -