Hello and welcome to AcmeCorp, how can I help you today?
Hi! I have been trying to make a purchase but for some reason the cart is not updating when I try and add an item
Sorry to hear that, let me help you with this.  First, can I have you log out / log in and try updating the cart again.
Thank you Logging out and in did not help. Sorry
Okay, let's try something else.  Can you check if the item is out of stock?  You can see it in the bottom left corner of the product page.
It is in stock. I checked a few times
Next, can you try refreshing the page and adding the item to your cart again?
Sure. Lets try that This seems to be working. Thank you
You're so welcome, glad we were able to get this resolved.  Is there anything else I can help you with today?
That is all. Thank you
Great, hope you have a wonderful day!