I have noticed a number times when one receives telephone calls from a person desiring to get in touch with another person.
The most likely response you hear will be: "Sorry, you got the wrong number" or "Sorry, he's not in".
Such a response does not help the person making the call.
A better response could be: "Can I take a message to give the person you wish to contact?"
When you get a call from a person who is looking for another person, be positive and provide a helpful solution to the person.