Among the most imbecilic innovations in contemporary American speech is the retort “No worry/worries” as a substitute for “You’re welcome” in response to the words “Thank you.” This new phrase can be heard emanating from the mouths of younger speakers such as servers in the hospitality trades.
“No worries” can now be added to “No problem.” Why “You’re welcome” is going out of use can only be ascribed to the general tendency in American English to increase the store of clichés of all stripes.