representing people iOS

Question

This is a "is it best to use the address book" question.

As part of an app for iOS 4.0 I'm writing, I want to represent that a person has requested something. How I was wanting to do this is allow the user to select a person from their address book using the AddressBook.framework.

What I would like to know is whether this is the best approach to take considering that:

1. The person may or may not be in the address book.
2. There will be little requirement for obtaining information such as phone number, address, email, et cetera.

Further, would it be best to limit the selection to particular groups? Also, how could I go about tracking (without iterating through every single request) to see how many requests a user has made.

Thanks,

Matt.