You can customize Email and SMS messages in your client dashboard. This video shows you how to customize these messages to suit the voice of your business.
Always ask the customer at the end of the job: "Would you mind if I send you a request for feedback on how I did today?".
Be sure to spell your customers name correctly and with the correct capitalization (IE. Susan Geoffrey NOT susan jeffrey).
Sending your review request as soon as possible while the great experience is still fresh in the customers mind.