The Successful Salesman.

About the video:
Arabic-accented speech

-It's a little forced due to the acting
-Customers are not always that polite...

Despite the video:

-I really don't think repiting what the customer just said is a good idea, like in this example, or when you order something at the restaurant, although in other cases like telephone ordering IT IS necessary.

-Avoid saying words like sir and madam, or even the last name's customer EVERY TIME you talk to him/her