//Makes sure required fields are present
if(Object.values(ticketInfo).includes(undefined)) {
    var missingFields = [];
    var ticketInfoFields = Object.keys(ticketInfo);
    //Push all missing fields to the array
    ticketInfoFields.forEach((element, index) => {
        if(ticketInfo[element] == undefined) {
            missingFields.push(Object.keys(ticketInfo)[index]);
        }
    });
    //Create the string of missing fields for the result
    var returnString = "Missing required fields: [".concat(missingFields.filter(function(el) {return el != null}).join(", "));
    //Set properties of the result before returning
    returnCode(400, res, ticketInfo, returnString, "]");
    return;
}