听力原文：Hi, Serra. This is Vicky from purchasing. The bookcase you ordered for your office is no longer in stock. I can place a special order for you but it will take at least 4 weeks for it to be delivered. I've seen a different one in the catalogue, though. And I thought you might want to have that one instead. If s a similar style. with Mark' s, and it can be in your office by the end of this week. Call me back and let me know what you want me to do. I'll be helping out with the inventory in the warehouse all day tomorrow. So, just go ahead and leave a message on my answering machine.
Why is the speaker calling？

A. To discuss a problem with the order
B. To confirm a delivery item
C. To request a catalogue
D. To request an order for office supplies