Centos backup thesql using cron job

According to this tutorial http://www.a2hosting.com/kb/getting-started-guide/backing-up-your-data/backups-on-dedicated-servers-and-vps trying to backup mysql database

I did:

1) created folders in home directory. /home/USERNAME/backup/

2) in folder backup created file, named backup-cron-mysql.sh

3) created content of backup-cron-mysql.sh

#!/bin/bash
db_name=dabase_name
db_user=user
db_password=password
backup_filename=$db_name-`date +%F`

mysqldump -h localhost -u $db_user -p$db_password $db_name | gzip > /home/USERNAME/dbbackup/$backup_filename.sql.gz

Made backup-cron-mysql.sh executable (Octal: 0755)

4) created folder dbbackup. path: /home/USERNAME/dbbackup/

5) Using putty.exe logged in and typed crontab –e, then Enter. Latter found that cron configuration file is located in directory /var/spool/cron/ and file name is root

6) opened root file with Notepad++ and pasted following code

45 14 * * *     /bin/sh /home/USERNAME/backup/backup-cron-mysql.sh
MAILTO=my@mail.com

As result in /home/USERNAME/dbbackup/ must see some file. But see nothing (empty folder).

Please advice what need to correct, to backup mysql