text: //Dummy hotel reservation centre
  var hotelReservationCentre = {
    reservationCounter: 0,
    getAvailableRoom(hotelname) {return Math.floor((Math.random() * 100) + 1);},
    getNewReservationId() {return ++this.reservationCounter;}
  };
  
  //Dummy flight reservation centre
  var flightReservationCentre = {
    reservationCounter: 0,
    getAvailableSeat(flightNumber) {return Math.floor((Math.random() * 200) + 1);},
    getNewReservationId() {return ++this.reservationCounter;}
  };
  
  
  
  class RoomReservation {
    constructor(date, customerName, hotelName, roomNumber) {
      this.id = 0;
      this.date = date;
  	this.customerName = customerName;
  	this.hotelName = hotelName;
  	this.roomNumber = roomNumber;
    }
  }
  
  class FlightReservation {
    constructor(date, customerName, flightNumber, seatNumber) {
      this.id = 0;
      this.date = date;
  	this.customerName = customerName;
  	this.flightNumber = flightNumber;
  	this.seatNumber = seatNumber;
    }
  }
  