Also,
don't mention it. No thanks are needed, I was glad to do it. For example,
Thanks for picking me up.-You're welcome, or
I appreciate what you did for Mother.-Don't mention it. Both phrases are polite formulas for responding to thanks. The first dates from about 1900; the variant was first recorded in 1841. For synonyms, see
forget it;
no problem, def. 2. Also see
welcome to.