I believe you are gravely mistaken

"We got that here last time." Words I hate to hear out of a guest's mouth. I had a few guests at my bar top who told me that they ordered a dessert here last time that we have never had, the dessert was a banana fosters cheesecake with a vanilla cream sauce on the plate. No sorry we've never had that, yet this still becomes an argument; "Yes you do, or at least you did, we were hear about a month ago and got it here." Me:"Sorry as long as I have been here we haven't had it." Them:"How long have you worked here, because we got it here." Me:"Well, I've been here for about 3 years now, and are you sure it was this location, or was it at another one of our restaurants?" This is where it always goes, "We only come to this location, we live in Anaheim Hills, so we would never go to another one because they are so far from us." Me:"Well I'm sorry, we don't have that dessert." Them:"I know you at least had, maybe it was something they had on a day you were off." Me:"Maybe that's what happened." Yeah, that's what happened, I was off for one day and they introduced a new dessert with out any notice, hell they even printed up a special "Hey Joe is Off" dessert menu and it was on there. I realize that most guests don't know our menu as well as us, and yes, mistakes happen and people forget where they got something, but why do you find the need to argue? Does it help to argue with me? Oh yeah, forgot, I'm hiding the dessert because I don't want you to have any, hahaha, plan is in full effect! It's like the person who doesn't understand English, no matter how much you raise your voice, they aren't going to understand you, same goes for something we don't have. Oh and when did the length of my career here become an issue? Do I look new, hell I explained our whole menu to you, but yet I don't seem to know what is on the dessert menu? Wow. I'm sure it was on there next to the never ending pasta bowl we don't have either.