Is it illegal for another person to sign for a food order that was placed on a different individual's credit card?

The individual whose credit card the order was placed on is giving their permission, but does that make it legal? Either way, if the person being asked to sign for the order does not feel comfortable doing so, should they be required to?

My boss was going into a meeting, and hadn’t ordered is food early enough like a responsible adult would in order for his food to arrive on time. (That’s on him.) Except that he then asked me to sign for the order (placed on his card), and to add a $5.00 tip. I told him that I did not sign for other people’s credit card orders. He seemed to deal with it fine (and actually had another person come up and sign for it for him), but I just want to know if he can in any way hold that against me.