Refactoring Lookup Function

I'm trying to refactor this function, but have hit a wall. What the function attempts to accomplish is find whether or not a contact exists within a JSON object, and if it does, determine if the second parameter provided is a property that exists on the specified object.

var contacts = [
    {
        "firstName": "Akira",
        "lastName": "Laine",
        "number": "0543236543",
        "likes": ["Pizza", "Coding", "Brownie Points"]
    },
    {
        "firstName": "Harry",
        "lastName": "Potter",
        "number": "0994372684",
        "likes": ["Hogwarts", "Magic", "Hagrid"]
    },
    {
        "firstName": "Sherlock",
        "lastName": "Holmes",
        "number": "0487345643",
        "likes": ["Intriguing Cases", "Violin"]
    },
    {
        "firstName": "Kristian",
        "lastName": "Vos",
        "number": "unknown",
        "likes": ["Javascript", "Gaming", "Foxes"]
    }
];


function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++) {
   if (contacts[i].firstName === firstName && contacts[i].hasOwnProperty(prop)) {
      retu contacts[i][prop];
   }

}

  for (var j = 0; j < contacts.length; j++) {
   if (contacts[j].firstName !== firstName) {
      retu "No such contact";
   } else if (!contacts[j].hasOwnProperty(!prop)) {
      retu "No such property" ; 
   }

}

// Only change code above this line
}

// Change these values to test your function
lookUpProfile("kyle", "lastName");