Final answer:
The best approach is to provide exceptional customer service by seeking alternative solutions for the customer, such as redirecting an ordered adapter or finding another store or online retailer with expedited shipping.
Step-by-step explanation:
The best course of action in assisting a customer who needs a special adapter that is out of stock would be to provide exceptional customer service by being resourceful and professional.
Since there is one that was just ordered for another customer, you might first check with your manager to see if it's possible to redirect that adapter to your current customer, assuming it has not yet been delivered.
If that is not possible, you can help by locating the nearest store with the adapter in stock or suggesting reputable online retailers where the customer can order the adapter with expedited shipping to the destination or an en-route stop.
Offering solutions like these helps demonstrate a high level of customer service and can lead to positive feedback and job satisfaction.
If you have a customer who's leaving the next day for a trip to another country and needs a special adapter for her computer, but your store is currently out of stock, the best thing for you to do is to tell the customer about the situation and offer alternative solutions.
One option could be to check if any nearby stores have the adapter in stock, and provide the customer with their contact information. Another option could be to offer to order the adapter for the customer online and have it shipped directly to her destination.