Final answer:
The associate should confirm the customer's request to change the watch band to another style and indicate that this service is available.
Step-by-step explanation:
Based on the scenario where the customer has tried on a watch, set it to the correct time, and inquired about changing the watch band to a different style which the associate has already shown to her, the appropriate response from the associate would be to affirm the customer's request. The associate should answer: "Yes, we can change the band to another style." This response is both helpful and geared towards making a sale by catering to the customer's preferences. Such personalized attention often leads to customer satisfaction and potentially a successful transaction.