My extra credit solution.

var message = "";
var userSearch;
var student;

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

function getStudentReport(student) {
  var report = "<h2>Student: " + student.name + "</h2>";
  report += "<p>Track: " + student.track + "</p>";
  report += "<p>Points: " + student.points + "</p>";
  report += "<p>Achievements: " + student.achievements + "</p>";
  return report;
}

while ( true ) {
  userSearch = prompt("Type a student name to pull their record. Type quit to exit.");
  if ( userSearch === null || userSearch.toLowerCase() === 'quit' ) {
    break;
  } 

  for (var i = 0; i < students.length; i += 1 ) {
  student = students[i];
  if ( student.name === userSearch ) {
    message += getStudentReport(student);
    message += "<br>";
  } 
  }

  if (message === "") {
    message += "<p>No user named " + userSearch + " was found.</p>";
    print(message);
  } else {
    print(message)
  }

}