Problem with program using objects

Question

This program should display something like Flight NGT 929 has landed, I added a readline() variable (letters) that should hold the NGT letters, please look at the remarks, I am getting a syntax error, and I have no clue about what I'm doing. Here's the code:

function main() {
//take flight number and its status
var flightNumber = readLine();
var flightStatus = readLine();

// ***** I added var letters below****
var letters = readLine();
var flight1;
//assign a flight object to flight1 variable

//output
console.log('The flight ' flight1.letters
+ flight1.number + ' is ' + flight1.status)

}

function Flight(flightNumber, status, letters) {
//fix the constructor
this.number = flightNumber;
this.status = flightStatus;
this.letters = flight1;
};

/*****REMARKS TO HELP WITH SYNTAX********
function person (name, age) {
this.name = name;
this.age = age;
}
var John = new person("John", 25); */

Answer 1

First of all you cannot take an input of your own using the readLine() because they are already defined for the code.

function main() {
//take flight number and its status
var flightNumber = readLine();
var status = readLine();

//assign a flight object to flight1 variable
var flight1 = new Flight (flightNumber, status);

//output
console.log('The flight ' + flight1.number + ' is ' + flight1.status)

}

function Flight(flightNumber, status) {
//fix the constructor
this.number = flightNumber;
this.status = status;
}

Answer 2

In the first answer I was told
I cannot take input using readline() because it is already defined for something else. No problem, but there are other things that I am missing, I am not asking you to solve the problem for me, just asking to point me in the right direction.
At this point without any help Sololearn will be useless to me because I cannot move forward unless
I can clearly understand this.

Answer 3

I'm getting this message "flight is undefined"

Here's the new code:

function main() {
//take flight number and its status
var flightNumber = readLine();
var flightStatus = readLine();

var flight1;
//assign a flight object to flight1 variable
flight1 = new Flight;

//output
console.log('The flight '+ flight1.flightId + flight1.number + ' is ' + flight1.status)

}

function Flight(flightNumber, status) {
//fix the constructor
this.number = flightNumber;
this.status = status;
this.flightId = flightNumber;

};