What are some of the best strategies used to delight and retain a customer?

Getting a customer to come back for more business is the best satisfaction certificate any service provider can have.  A few tips:

1. Gather his requirements with clarity, when in doubt ask and be sure to have understood the exact need of the customer
2. Deliver the requirement on time, with quality, in line with expectation
3. If budget, time, and company process allow, delight him with an additional package
4. Follow up (very important) and ensure that the customer is truly satisfied with the delivery and promise to assist in case of any gaps
5. Most importantly, be polite and pleasant through out your interaction

Always listen to what the customer needs, offer solutions, then follow up on the customer and see how your solution helped the customer

Be punctual and patient always.Be attentive of customer wants.always approach them a big smile,and always value them.

1. Understand the needs & exceptions of the Customer .

2. Provide the valuable suggestions relevant to his/her requirement.

3.Ensure that, you are delivering as per the requirement without any deviation in Quality/time/Scope .

4.Always serve with a Smile and demonstrate your confidence all the times.

5. Use feed back form for the improvements.

To retain a customer, we have to OFFER a world class product /  services and making sure that the customer remains satisfied in terms of quality as well as price. 

An Example: Services of Emirates Airline. This Airlines is continuously expanding it business defeating the others through best serfvices.

Just read the book Zappos by Tony Hsieh... it's all there.

Continuous offers and discounts 

Offer them the best service you could give them and treat them more than the way you want to be treated and respect them more than the way you respect your self as a costumer because even the richest or poorest person alive will still be called as a costumer.Everyone is a costumer.