All you need to do to show interest is initiate a chat with him. If he doesn't take the bait, he isn't interested. Doing anything more appears desperate and certainly doesn't help in attracting him. When it comes to attracting men, you have to have the mindset that you don't mind if he isn't interested because there are plenty of other men.
A strong woman takes advantage of help she can get from people around her but she doesn't rely on them for anything
She uses logic and manages her emotions
She offers help either because it is a business transaction or out of kindness. It is never because she hopes others will return the favour or out of fear of losing them
She has her own mind and thinks for herself and knows that she has to be the one who bears the consequences of her decisions