Solution to extra problem

var response = "";
var searchQuery = "";
var studentFound = false;

while ( true ) { 
  searchQuery = prompt("Enter a student name. Type 'quit' to exit");

  if (searchQuery === null || searchQuery === 'quit') {
    break;
  }
  else {
    // re-initiate response message 
    // and studenFound for every search query
    response = "";
    studentFound = false;

    // search through all students to find a match 
    for (var i=0; i<students.length; i++){

      // if there is a match
      if( students[i].name.toLowerCase() === searchQuery.toLowerCase()){

        // change flag to true
        studentFound = true;

        // concatenate student report
        // to print all student with the same name
        response += getStudentReport(i);
      }
    }

    // if there is no match
    if( ! studentFound ) {
      response = notFoundMessage(searchQuery);
    }

    // print response
    print(response);
  }
}

function getStudentReport(studentId) {
  // get student report
  var report = "<h2>Students: " + students[studentId].name + "</h2>";
  report += "<p>Tracks: " + students[studentId].tracks.join(", ") + "</p>";
  report += "<p>Points: " + students[studentId].points + "</p>";

  return report;
}

function notFoundMessage(searchQuery){
   return "Sorry.. We don't have a student named " + searchQuery + ".";
}

function print(message) {
  var divHTML = document.getElementById("output");
  divHTML.innerHTML = message;
}