Not at all

You're sitting at a coffee shop. A stranger asks, "Would you mind watching my stuff for a minute?". You're happy to do that, so you answer.  Not at all.

 This is one way to respond when someone asks "Do you mind...?" Answer this way if
you're happy to help this person.

Here's an example of a short conversation:

A: Do you mind giving me a hand with this?

B: Not at all.

A: Thanks!

This answer sounds polite and slightly formal. A less formal answer would be "Sure."

A: Would you mind calling me when you're done?

B: Sure.