How to ask startup people for introductions

I wish more people understood how to ask for an introduction with grace. Too often it feels like there's no option to say no.

Great post man, totally agree. People are busy you got to make it easy for them to help you.

If the person you want to get intro-ed to is too busy to currently help you out, is it typically OK to follow up again just a month later? Or would you recommend trying to get intro-ed by someone else?