Very unique reference number upon completing form

Hi,

I’m trying to achieve the following.
I would ask the visitor to complete the form by providing their name and record the current date.
Then I would generate a unique reference number by using the date(day+month) and the first two alphabets of their name. The reference number will be added to the email sent out to admin and visitor upon request.

Example, the form is completed on 09042019, and the name is Jonhny, so the unique reference number would be 0903JO, how can I achieve this?

I’m looking at Contact Form 7 Dynamic Text Extension plugin but I’m not sure if I can achieve this with the plugin.

Thank in advance