I spoke to my prospective customer in USA they are saying they need my visa for assuring if I m not lying about my visit,then they will think to issue appointment letter,but I m not in.favor to send my passport then they said they can meet me any time if I come and visit them is it pk to take that email at POE or appointment letter is must, I also want to make some cold call with different companies and shop who are interested in our products.