The king warmly welcomed Sam as he was used to doing so with his guests.
"I welcome you to our planet! We're happy you decided to visit this place. You'll have a luxurious time until you're here."
The king's words took away Sam's confusion. He made him easy to deal with. He was trying to be satisfied when the king asked him for his introduction.
He had pre-planned everything but was not expected to be taken in front of the king and to be asked for his identity.
Before coming on Mars, he thought no one would notice him when he would be looking exactly like him. However, he didn't know that it was not the human's place where everyone had their own life. All Aliens were connected. And due to the least population, all of them almost recognized each other.
Even if they didn't fully recognize everyone, they could determine from their talking and walking style that the one was one of them or not.