In addition to the informal alternatives already suggested by Joe and Matt, you have the informal responses: That's OK That's all right And a couple of more formal and polite ones: Not at all My pleasure

"No problem" "No worries" "Anytime" "Sure thing" Are all good alternatives. They are all more casual than "You're Welcome" though.

You can try "Don't worry about it" or "Happy to help".

Hi! You can say "Not at all", "My pleasure", "Don't mention it", "Sure", for example.

Yes, lots. "Of course!" and "Any time" are other casual ones. When I'm being pretty informal, I actually just say, "yep!" with an upward lifting tone.