Hello and welcome to AcmeCorp, how can I help you today?
I am trying to buy a pair of jeans and it says that my credit card is invalid. Can you help?
I will be happy to help you with this.  First, can you try logging out and logging in back to your account and try the purchase again?
Yes, I tried that. It did not work.
Okay, next can you refresh the page and try entering in the credit card number again for the purchase.
I tried that also. The credit card is still getting rejected.
Okay, next can you try checking the expiration date on your card.  If it's expired, the system won't let the purchase go through.
You are right. It is expired. I should have looked at that.
Oh yes, if you try another card it should be able to work.  Glad we were able to get this resolved.  Is there anything else I can help you with today?
No, that is all. Thank you.
You're welcome, hope you have a nice day!