Need help with Javascript

Hi Experts
I need help with Javascript...


function ticket(){
      
var ticketType = prompt("what sort of tickets do you want?");
var ticketQty = parseInt(prompt("how many tickets do you want?"));
var ticketPrice;
switch (ticketPrice){
      case "A":
      case "100":
      break;
      case "B":
      case "75":
      break;
      case "C":
      case "50":
      break;
      case "!A":
      case "!B":
      case "!C":
      document.write("Invalid Ticket Type");
      break;
      case
}
document.write("Ticket type is " + ticketType + "<br>");
document.write("Ticket quantity is " + ticketQty);
}