Thank you for contacting Acme.  How may I help you today?
Can you tell me when my promo code expires?
Yes, in general, our promo codes are valid for one week

They are generally limited-time offers
Okay great. I was hoping to use it tomorrow.
It's easy to miss, but if you look very closely at the bottom of a printed coupon (or the image on your computer or phone) you can see an exact date But you should be in good shape if you use it tomorrow
That's good to know.
Indeed.  Is there anything else I can help you with today?
That will be it thanks
You're welcome.  Have a great day