Vlookup within Form, Able to Overwrite

TAbs

I want to create a form that when a certain name is selected, it prepopulates the remaining fields BUT allows the option to override meaning it can't be a true vlookup as it locks the field. AND I need this option avaliable within the form prior to submission. Is this possible?

Ie. I select my name in the form, it populates my number, address, and email address but allows me the option to override it to someone elses info if necessary.