When hiring help desk specialists, employers are looking for candidates who demonstrate both technical expertise and strong customer service skills. Be prepared to answer technical questions about how to troubleshoot issues relevant to that company's technology as well as situational questions to assess how well you can keep your cool with frustrated clients.
How would you react when you are in a bad mood and a customer comes to you and is not talking to you in a good manner?
I'll be cam and still help the customer but if the customer doesn't gets better i'll call the supervisor and ask him to help the customer.
Roll my eyes first, hiss, then swear at the customer.