"You need to fix this. I need it on or before next Tuesday and I know it won't arrive by then. So I need to expedite the order or something."

$?$

What would you do$?$

Verify customer, provide return label as needed, locate item locally.

Get order number, explain the order can't be cancelled and tell customer they can return the item to the store when it shows up$.$

Empathize and acknowledge the customer's concerns. Verify their identity and expedite if possible. If this is an item needed by a specific date that exceeds delivery date, look for local availability$/$offer to find comparable item.