Chase the other customer down and see if they will give it to your customer.
Take the name of the customer and their number. Call another location for any extra stock of that item and have them ship it to you via standard company procedures. Assure the customer (guest) you will call them when the item has arrived in store.
I’ve always struggled with perfectionism – I truly want to do the job correctly the first time, but this sometimes means that I devote more time to a project than is necessary. I’ve learned to balance this drive with the equally important responsibility of meeting deadlines.
I explained my personal success stories from my actual employer, and my other skills that would be very useful for this job : being a skilled driver (we ofter drive with a trailer), not scared to get dirty (we often do), and a hardworker.