Outlook macro to make a call

Hello,

I'm using an outlook macro to run a powershell script.
The powershell script queries my outlook contacts, displays their Name and phone number and then prompts to read a phone number from user.
user inserts the number and makes the call. i attached an outlook button to this macro but i want the macro to open outlook contacts instead of directly running powershell and get user from input. then the user selects the desired contact from the list to make the call.

Thanks for helping.