1
general::
Phrase(s): You’re welcome.
Go to You are welcome.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
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.
American Heritage Idioms