John Travolta has recalled a heartbreaking conversation he had with his son Benjamin following the death of Kelly Preston last year.John - who shared three children with his late wife - appeared on Kevin Hart's talk show series Hart to Heart when he spoke about the aftermath of their loss.MORE: John Travolta celebrates 'proud dad' moment – and it will melt your heart WATCH: John Travolta shares rare video with son ahead of anniversary of Kelly Preston's death"He said to me once, 'Because mom