Mass updating constituencies for a list without IDs?

Hello! I'm not sure what I'm asking is possible, so I figured some great mind in the community might be able to help me figure it out. 

The ballet academy branch of our company uses a different database for students, tuition, schedules, etc. We are wanting to find the parents of academy students in Tessitura and give them a constituency to signify them as academy parents. Unfortunately because they use a different database, I do not have ID numbers for each constituent, only their name, address, email, and phone number.

Is there anyway for Tessitura to find these constituents without their ID to make a list for a constituency update, or will it need to be done manually one by one by searching their info?

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