Graham Norton
He is a BBC talk show host, and doesn't try and make the segments about himself. It's an amazingly relaxed set. He asks a question and lets the guest run with it, and if another guest has input, Norton encourages the interplay rather than trying to return focus and the spotlight back to himself. More than once I have heard his guests say they have never had more fun on a talk show.
Being BBC, the rules are different, so I'm not adding a link... The language might get me paddled by the mods...
The best segment I've seen so far had Will Smith, Ryan Reynolds, Catherine Zeta-Jones, and Toby Jones (Who most know, you just don't know it.)
I get caught in a loop when I watch. The clips with Bill Murray, Tom Hanks, and especially Matt Damon are great.

