Fudge didn't come there to tell Harry everything is fine and dandy.
He had come to make sure that Harry was safe and had a safe place to stay, under his eye, in wake of:
Sirius Black's escape from Azkaban.
He made Harry promise that he wouldn't stray far from the Alley:
He could even go wherever he pleased, as long as it was in Diagon
Alley, and as this long cobbled street was packed with the most
fascinating wizarding shops in the world, Harry felt no desire to
break his word to Fudge and stray back into the Muggle world.
The Weasleys and Hermione didn't arrive there until the end of the holidays:
Harry woke on the last day of the holidays, thinking that he would at
least meet Ron and Hermione tomorrow, on the Hogwarts Express. He got
up, dressed, went for a last look at the Firebolt, and was just
wondering where he'd have lunch, when someone yelled his name and he
They were there, both of them, sitting outside Florean Fortescue's Ice
Cream Parlor -- Ron looking incredibly freckly, Hermione very brown,
both waving frantically at him.
They had in fact come to get to the Hogwarts Express and probably to purchase stuff for the school:
"You can ask Dad yourself this evening. We're staying at the Leaky
Cauldron tonight too! So you can come to King's Cross with us
tomorrow! Hermione's there as well!"
Hermione nodded, beaming. "Mum and Dad dropped me off this morning
with all my Hogwarts things."
They knew however what happened with Aunt Marge:
"I got all my school stuff last week," Harry explained. "And how come
You knew I'm staying at the Leaky Cauldron?" "Dad," said Ron simply.
Mr. Weasley, who worked at the Ministry of Magic, would of course have
heard the whole story of what had happened to Aunt Marge.
"Did you really blow up your aunt, Harry?" said Hermione in a very
Quotes are from Harry Potter and the Prisoner of Azkaban.
Same is true for the movie more or less.
Fudge came for the same purpose in movie as well. Quoting the script:
Harry: I don't understand.
Harry:I broke the law. Underage wizards can't use magic at home.
Fudge: Come now. The Ministry doesn't send people to Azkaban...for
blowing up their aunts. On the other hand, running away like that,
given the state of things...was very, very irresponsible.
Harry: "The state of things," sir?
Fudge: We have a killer on the loose.
Harry: Sirius Black, you mean? But what's he got to do with me?
Fudge: Nothing, of course. You're safe. And that's what matters. And
tomorrow you'll be on your way back to Hogwarts. These are your new
schoolbooks. I took the liberty...of having them brought here. Now Tom
will show you to your room. Oh, by the way, Harry. Whilst you're here,
it would be best if you didn't... ...wander.
Harry and his friends however have the conversation about the Aunt Marge Episode on the train instead:
Harry I didn't mean to blow her up. I just...I lost control.
Hermione: Honestly, Ron, it's not funny. Harry was lucky not to be
Harry: I was lucky not to be arrested.
Ron: I still think it was brilliant.