CAN A BANK SAY "SORRY, WE HAVE RUN OUT OF CASH"?

Reading this letter about maybe one of the biggest banks in Asia, A SORRY EXCUSE FOR MAYBANK initially gave rise to a feeling of incredulity, but which was later overtaken by a deep sense of sadness! Imagine a bank of this stature giving out such an answer to a customer. If this sorry state of affairs is allowed to continue, will the bank subsequently tell its customers, "sorry, we have run out of cash"?