Phrases Offering and Refusing Help

I'll let you know if I need help.

B1

Meaning

I'll contact you if I require assistance.

Example sentences

John: 'Let me know if you need any help with the project.'

Alice: 'I'll let you know if I need help.'

John: 'I'll let you know if I need help.'

Alice: 'Don't hesitate to ask for help if you need it.'