The exchange was documented by TV producer Andrew Kimmel who praised the actor and said "little moments like this can make such a difference in people's lives".

Following a flight from London to New York, the boy asked Reeves for his autograph and a "series of rapid-fire questions".

According to Mr Kimmel, the star of The Matrix and John Wick "happily responded to every single one".

In the exchange, which has gone viral on Twitter, the 57-year-old actor told the boy he had been in London filming a documentary.

He also talked about attending the Formula 1 grand prix at Silverstone at the weekend.

Reeves told the boy he was in New York for five days to see a broadway show.

Mr Kimmel shared a brief transcript of their exchange:

"Kid: Why were you in London?

"KR: Filming a documentary.

"Kid: I saw online you were at the Grand Prix (pronouncing the x)

"KR: Yes, the Grand Prix (in a French accent, without correcting him). F1! Race cars!

"Kid: Do you drive?

"KR: Not F1, but I like riding motorcycles.

"Kid: Do you live in NY?

"KR: I live in LA.

"Kid: How long are you gonna be in New York?

"KR: Four days! No… five. Five days!

"Kid: Why are you in NY?

"KR: Gonna see a broadway show!

"Kid: What broadway show?

"KR: American Buffalo! Mamet!

"Kid: Where are you staying in NY?

"KR: Midtown!"

Mr Kimmel wrote: "By this time the kid was running out of questions, so Keanu started grilling him. Why were you in Europe? What galleries did you go to in Paris? What was your favorite?"

He added: "The man could not have been nicer, especially after an international flight.

"I thought I'd share this because the dude is a class act and little moments like this can make such a big difference in people's lives. We need more Keanus!"

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Reeves has previously been called the "nicest man in Hollywood" for how he responds to fans.

He was at the British Grand Prix at Silverstone as he prepares for a role in an F1 documentary.