Why is the if - else statement not working on this challenge?

var search; 
var studentReport = '';
var student;
var found;

function print(message) {
  var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

function getStudentRecord(obj){
  var report = '<h4>Name: ' + obj.name + '</h4>';
      report += '<p>Track: '+ obj.track + '</p>';
      report += '<p>Achievements: '+ obj.achievements + '</p>';
      report += '<p>Points: '+ obj.points + '</p>';
    return report;
}

//'while' loop allows the program to continually ask user to 
//enter student name until user types quit
while(true){
  search = prompt('Enter student name i.e "Dave" or type "Quit" to quit.');
    found = false;//assume student value entered is not found

  if(search === null || search.toLowerCase() === 'quit') break;

  for (i=0; i<students.length; i++){
        student = students[i];
        if(search.toLowerCase() === student.name.toLowerCase()){
          studentReport += getStudentRecord(student);// '+=' appends 'student' value  to 'studentReport' instead of just assigning it which means that each student name searched will show when 'print' function is called.
          /*using '='  only assigns value to studentReport which means that it will overide the last student value and will only show last matched value when print function is called.*/
          print(studentReport);
          found = true;
        }
      }
//if value is false alert user student is not found. 
  if(!found){
      alert('Student not found!');
   }
 }