Solution for Extra Credit (Student Record Search Challenge) - Feel free to review code and provide feedback!

// variables that I used for the program as well as the print function.
var student;
var userInput;
var name;
var message = "";
var counter = 0;
var reports = [];
var reportAvailable = false;

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

//formats report from object and returns it
function getReport(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;
}

//resets key variables used for multiple report lookups
function reset() {
  message = "";
  counter = 0;
  reports = [];
  reportAvailable = false; 
}

//stores the report (for potential multiple reports)
function storeReport() {
  reports[counter] = student;
  counter += 1;
}

//retrieves input from user
while (true) {
  userInput = prompt("Please input a name or type quit to exit.");

  if (userInput === null || userInput === "exit") {
    break;
  }

//valid/non-error responses (including "") are passed through
  userInput = userInput.toLowerCase();

  for (var i = 0; i < students.length; i += 1) {
    student = students[i];
    name = student.name.toLowerCase();

//if the user input matches a valid report, the report is stored in a separate array and is flagged to advise that there is a report available

    if (name === userInput ) {      
      storeReport(student);
      reportAvailable = true; 
    }
  }

  // retrieves and displays reports, or advises that there aren't reports to display
  if (reportAvailable) {

    message += reports.length + " report(s) for retrieval.";

    for (var i = 0; i < reports.length; i += 1) {
      var reportRequest = reports[i];
      message += getReport(reportRequest);
      print(message);   
    }   
  } else { 
    print("<p>" + userInput + " could not be found. Please try again!</p>");    
  } 
  reset(); //resets variable for multiple lookups
}