Final answer:
In such a situation, offering a similar brand that you do carry would be the best approach.
Step-by-step explanation:
In a situation where a customer wants a brand that you don't carry, it is important to handle it in a professional and customer-focused manner. The best approach would be to offer a similar brand that you do carry as an alternative.
For example, if a customer wants a specific type of shampoo that you don't have in stock, you can recommend a similar shampoo from a different brand that you do carry.
By offering a suitable alternative, you can meet the customer's needs and provide them with a positive shopping experience.