Thanks...but I'm not going to the bank right now.
thanks...but I've got another appointment right now and I'll stop at the bank after I'm done.
thanks...but I don't think we can get there before they close.
thanks...but I forgot my coat . Can you wait just a minute
Euphemism
Explanation: an innocuous word or expression used in place of one that may be found offensive or suggest something unpleasant.