What does Geoff tell their father about Sophies story?

Geoff tells their father that Sophie’s story about meeting Danny Casey is just one of her fantasies. He doesn’t outright deny it, but he hints that Sophie has a tendency to imagine things that aren’t true. Geoff’s response reflects his more grounded and realistic nature, as he understands that Sophie’s dreams are far-fetched and not based in reality. His statement shows that he recognizes Sophie’s desire for excitement but also feels the need to keep things in perspective, especially in front of their practical father.

This question related to Chapter 8 English Flamingo Class 12th NCERT.
From the Chapter 8: Going Places.
Give answer according to your understanding.