When you Thank you, the normail response is You're Welcome......

I was at a diner earlier....

I threw out other responses....

Brought my coffee....I said Cool...she said you're welcome

Brought my food....I said Yummy...she said right on

Brought me more coffee....I said sweet....she said dude (reference from (Dude, Who stole my Car)
At first I didn't get it..lol

So, with a cool waitress...convo can be entertaining...and short