Why does the man want to contact Ms. Park?

M: Hello. This is Joshua Smith. I’m returning Harper Park’s phone call. She left me a message about the Web site design she’s working on for my company.
W: I’m sorry, but she’s unavailable at the moment. Ms. Park usually works until 5 o’clock on Fridays, so she’s already left for the day. Is there anything I can do for you?
M: Well, first of all, I’d like to receive a price estimate as soon as possible because I have to submit a document to the Accounting Department by Monday morning. In addition, Ms. Park asked me to choose between two design options.
W: Okay, let me transfer you to Sarah Smith, Ms. Park’s associate. She’ll be able to help you.