Business cards are less important in American culture than they are in Asian culture. Knowing the right way to handle business cards is a useful skill where will you are. Requesting someone's business card is a staight forward process. You need only say," Do you have a business card?" or " May I have your business card?" When you want to present your own card you can say," Here is my card. Feel free to call me if you have any other questions." Or you might say," Please sent the information to the address. I look forward to hearing from you soon." It's not polite to directly refuse a request of someone for your business card. Instead you can say," Sorry, but I am afraid I am all out at the moment." or " I forgot to bring them with me." When you do receive a card, say " Thank you." and exam it briefly before putting it away.