If you need anything, I am at your service.

您要是需要什么，请尽管吩咐。

《牛津词典》

If you need anything else, just pick up the phone or drop me an email.

如果你还需要什么，就给我打电话或发电邮吧。

youdao

Just ring if you need anything.

需要什么东西，你就按铃。

youdao

"'Let me know if you need anything, ' and that was it, every time, " Arlene Castro recalled.

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If you need anything, she can make two phone calls and make it happen within five minutes.

FORBES: On Being A Filipina Business Woman And Having It All

If you need anything, call me.

FORBES: All in the family