If your client shows clear interest in your products, you could see if the client is interested in also buying some other products, a product that can help to maintain the hair extensions very well (a Hair Extension Shampoo
) or that can help to give a better look (Bending Rollers
Up-selling helps when your client is interested in one of your lower priced products, but is also interested in a more expensive one (longer length, better quality or other texture). Here again your knowledge of the product can help your client in the purchasing process.
But be careful, at any time you have to avoid the client gets the idea you only want to sell more, make sure the deal is also interesting for the client, otherwise you will lose clients. So here it is important you know your client also for example to know what they are interested in or the budget they like to spent.