how to add logical operators?

I have been trying to work this issue of on Codecademy all day. Nothing I do seems to work.

Instructions: "Add some if/else statements to your cases that check to see whether one condition and another condition are true, as well as whether one condition or another condition are true. Use && and || at least one time each."

This is the code I previously entered:

var user = prompt("What is your name?").toUpperCase();

switch(user) {
case 'Sam':
    console.log("Hi, Sam");
    break;
case 'John':
    console.log("Hi, John");
    break;
case 'Mary':
    console.log("Hi, Mary");
    break;
default:
    console.log("I don't know you. What is your name?");
}