ありえない味がするというお客さん

(At the bar)

Me: Are you ok?
Customer: Excuse me, I ordered a diet coke but this is cherry coke.
Me: Cherry coke? That's weird I served you diet coke. And we don't have cherry coke. 
Customer: Noooo, this tastes like cherry coke.
Me: We can check if you want. (So the customer can see I grab the bar gun, push the button for diet coke and pour a little bit into two glasses.)
Me: (I taste one of the diet cokes) Hmm, I think it's just normal diet coke. Could you taste it again?
Customer: (Customer tastes one of the diet cokes) Hmm,,, yeah yeah it tastes the same. I thought cherry coke. but it's not.
Me: Are you happy with the diet coke?
Customer: Hmm, ok, that's fine. Thank you.


(At the bar)

Me: Are you ok?
Customer: Excuse me, I ordered a diet coke but I think this has alcohol in it.
Me: Really? That's weird I served you diet coke. I didn't put any alcohol.
Customer: But I can taste alcohol in it.
Me: We can check if you want. (So the customer can see I grab the bar gun, push the button for diet coke and pour a little bit into two glasses.)
Me: (I taste one of the diet cokes) I'm sorry it's just normal diet coke.
Customer: (Customer tastes one of the diet cokes) Hmm,,, it tastes similiar but I think my one tasted a bit like alcohol before.
Me: Hmmm, would you like to have another diet coke just in case? It's same as before though.
Customer: Is that ok?
Me: That's fine. Hope you are ok with this. Here you go. (I serve another diet coke for the customer.)
Customer: Thank you.
Me: No worries.