He treated his friend for lunch with the dining voucher.
After paying for the meal with the voucher and the balance amount with credit card, they left the restaurant.
While waiting for the lift, David realized that the staff did not take the voucher.
The two of them looked at each other and a bad thought came to them.
Now should he goes back to the restaurant or keep the voucher and use it again at another of the outlet?
He went back to give the voucher to the manager.
The manager was relieved and said, "Thank you very much. Otherwise, I will have to pay for the loss."