Today's phrase is " don't hesitate to ask "
This is a polite way to tell someone that they may ask for help any time.
Example 1
If you need anything else, don't hesitate to ask .
Example 2
Don't hesitate to call me if you have any questions.
Example 3
If you need more information, don't hesitate to email me.
https://idioms.thefreedictionary.com/If+there%27s+anything+you+need%2c+don%27t+hesitate+to+ask