A suggested dialogue:
“John
Now that we have finished your current course of treatment, here is a mirror – take a look at your smile and let me know what you think.
(assume positive response)
I agree – we are delighted with the result also.
John – at this point it’s our normal practice to ask our patients a couple of favours – do I have permission to ask you?
(assume positive response)
First of all, you may know that our business grows primarily through word of mouth marketing.
I have here three copies of my business card:
I would be delighted if you would pass these on to any family, friends or colleagues that you think would benefit from a visit to a practice like ours. Would that be OK?
(assume positive response)
John, is it OK if I go for the second favour?
(assume positive response)
You may have noticed in our patient lounge a testimonial folder, in which we invite patients to write about their customer service experience.
Would you have any objection to adding a letter to our folder?
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(@ChrisBKH) (@ChrisBKH) said 
Richard Hughes said 
chas lister said
great – the completion interview – we have a the six critical questions for testimonails now work really well to get good structured testimonials