How should a salesperson approach an impatient customer?

With an attitude that makes the customer feel that his time is most important. Apologize for any time he had spent waiting on help and try to lessen his anxiety by offering hom a seat & drink while you look up or for his part. if you realize you do not have the part he needs be sure to contact another location or even your competitor to find where he will be able to get one that day. ByGoing out of your way no matter if you make a sale or not shows the customer that you really do care about his business and he'll most likely come back to you again next time as well. Good luck!