public void dealWithBookSelection(Map books) {
        Scanner input = new Scanner(System.in);
        int whichBook = input.nextInt();

        BookMgr bookMgr = new BookMgr(books);
        if(bookMgr.reserveBook(whichBook)) {
            System.out.println("Thank You! Enjoy the book.");
        } else {
            System.out.println("Sorry we don't have that book yet.");
        }
    }