NY Times -- Today we have a guest post by Michael Melcher, a career coach and frequent contributor to "Shifting Careers." He offers some advice on how to handle the silence people often face in response to calls and e-mails sent in connection with a job search. Though he came up with these tips specifically to help those looking for new jobs, the advice also applies to any situation in which you are making a contact and hoping for an answer — from pitching a product or service to setting up informational interviews or raising money for a new venture.