- I'll find out more and get back to you later.
- I'll google it for you now and let us see.
- I'll write a test script now. Let us test and see what are the result
- I'm not too familiar with this subject. Perhaps [people name who familiar] able to help you.
Instead of letting other people to think I'm a clown (my defination for that label), I would rather just say "I don't know, let us check the online documentation and maybe we can find something there".