There are two ways to improve your service, and yourself: maximize your strengths and minimize your weaknesses.
Silent customers can be deadly. Encourage them to complain.
If it's not impossible, you may as well try. If it is impossible, at least you'll find out why.
Good customers want good quality service. Great customers want it even more.
When something needs to be improved, take your medicine - fix it.
Convince people and you win their minds. Inspire people and you win their hearts.