Where are you going?

I walked up to the Aer Lingus checkin counter at JFK and here is the conversation:

Lady : Passport please. I see you are going to Dublin and then to…Where are you going?
Me: Dubrovnik
Lady: Du..du…du.. What?
Me: Dubrovnik
Lady: I never even heard of that country
Me: It’s a city. It’s in Croatia.
Lady: Croatia is a country?
Me: Yup.
Hands me back my passport and says, “Have a good time in your fake country.”