Export CSV data to Excel Userform using reference number to specify relevant data

I have a Notepad saved in a folder which I keep notes everytime I speak to a customer.

What I would like to do is create a userform where I can input a case reference number and click a command button which searches the CSV/TXT file for any notes for the specific reference number and then returns all notes (seperated by a blank line) in the textbox within the userform in the posted/saved format.

I can find lots about importing to excel but nothing about importing data to userforms. Is what I am attempting possible and if so what should I be googling/researching to assist me in doing so?

CSV file added for format. The userform contains two text boxes, one blank for import and one for completing the case reference number (format on CSV file. Line item 1).

i.e. if I searched by SL-001-0155648 I would get the below (It's not code but I thought the best way of showing what I mean):

SL-001-0155648, SLewings, 16/06/2014  15:13:27
Spoke to Mr S on the phone and he is an idiot

SL-001-0155648, SLewings, 18/06/2014  21:13:27
Mr S Called again and he's even more annoying this time