The dialogue discusses the differences between life when the grandfather was young compared to modern times. Some key points:
1) People couldn't email when the grandfather was young because there were no computers. However, they could play outside more safely as there were fewer cars.
2) Holidays were difficult because plane travel was very expensive. The grandfather's best holiday was in France where he met some friends who he is still in contact with today.
3) Technologies like computers make it easier to stay in touch with friends, but it's harder to form real friendships like the ones the grandfather had when meeting people in person.