Find a specific sentence in a cell full of text

Hi,

Very new here and very new to excel formulas.

Could you tell me how I can find a specific sentence within a cell that contains many sentences.

for example

I want to find, "I am new." within a text that contains, "Hello I am Bob. I am new. I live in england."

I am currently using =+FIND(AB$1,$V2) where AB1 contains the sentence I am looking for and V2 contains the cell full of sentences. However this returns #VALUE! when the sentence is not found. I want it to return null.

thanks in advance.

Ben