How can I add EXTRA COMMENT FIELDS in Comment and Display it in Comment Box

I’m looking for a tutorial or a plugin that will add an extra field to the comments page and get the details displayed for me in the comment box. For example, the current comments form after every post looks like this:
Name __________
Email ___________
Website _________
Comments _________

I would like to add extra/custom phone number fields to make the comments form look like this:
Name _____________
Email _____________
Phone _____________
Comments ________________

This would then be stored in the database and displayed to me after the comment is submitted.

Could somebody point me in the right direction please? Thanks in anticipation for this.