Answer:
Tell the customer when you store’s next delivery day is and to come back then Issue the customer a raincheck for the item that is out of stock
Step-by-step explanation:
Customer retention is important as well as meeting their specific needs. It is unwise to turn back a customer and refer them to a competitor, this may mean loss of business (currently and in the future). Also it is unwise to offer a substitute item as this will not meet their needs (though you may want to inform them of the substitute item if they are interested). Issue the customer a raincheck for the item that is out of stock is the best way to go and keep the business.