England is not Britain. If aliens do try to contact us I only hope the person who responds knows basic Geography.
Would John Oliver
suffice? Because, I think he would make for a perfect greeter for the human species.
I think it should be Harrison Ford because he could cover any aspect that would be needed in order to converse and deal with an alien.
He has dealt with various aliens from his experience in the many star wars movies.
He knows a lot about the earth's ancient history helping to explain our earth's history to these aliens (not to mention how adventurous he is) in his various Indiana Jones movies
He know alot of spies, government and is quite intelligent as evidence as Jack Ryan movies
He was a kick-ass president of US in Clear and Present Danger
He was even in a movie called Cowboys and Aliens (although I have no idea about anything to do with this movie just he was in it)