You can do this by first creating an information map with an identity-driven pre-filter to provide the desired values. There is more information on how to do this in the SAS 9.2 Intelligence Platform Security Administration Guide, Chapter 8 BI Row-Level Permissions (http://support.sas.com/documentation/cdl/en/bisecag/61133/HTML/default/a003073623.htm)
Once you have an information map that provides the appropriate identity-driven values you can use that as the source of the prompt. If you have a information map named IdDrivenMapOfValues with a single item named MapItemForValues containing the identity-driven/filtered values you can populate your prompt as follows:
* Prompt type: Text
* Method for populating prompt: User selects values from a dynamic list
* Data source: /path/to/your/IdDrivenMapOfValues(InformationMap)
* Data Item: MapItemForValues
I just tried this out and was able to see different prompt values when logging in as different users.