American English - no problem

I just started a short segment on my podcast called "American English Minute," based on everyday English that I notice around me in Chicago. A student suggested I start something that explains English here, and I decided to link it to my podcast because I often talk about writing with broadcasting pros.

Today’s phrase is “no problem.”

In the United States, when someone says “thank you,” the other person might respond with “no problem.”
You can hear this in various places, especially stores and restaurants, and in casual conversations. For example, at a hot dog stand, if you ask for extra mustard and say thanks, the worker might say, “no problem.” Or at a store, if you ask for a bag and they don’t charge you, and you say thank you, the person might say, “no problem.” Another example is if you miss someone's party because you're sick, the friend will say "no problem" when you apologize for not coming.

This expression is similar to “no worries,” which has become more common in American English in recent years.
Both phrases are casual alternatives to “you’re welcome.”

If you have suggestions for future phrases, let me know.