You could even phrase it so the “customer is right about what a machiato is”, like “I’m sorry, this is what we call a machiato here, can you tell me what you’re looking for?”
Hiding behind the bar trying to guess someone’s order isn’t good customer service. Asking the customer to clarify what they want so you can make it exactly how they like it is good customer service.
“What do you consider a Machiato?” is still “Customer is always right”.
You could even phrase it so the “customer is right about what a machiato is”, like “I’m sorry, this is what we call a machiato here, can you tell me what you’re looking for?”
Hiding behind the bar trying to guess someone’s order isn’t good customer service. Asking the customer to clarify what they want so you can make it exactly how they like it is good customer service.