[SDF - 66538]How to include mail_Im_responding_to_timestamp in a request reply?

[SDF - 66538]How to include mail_Im_responding_to_timestamp in a request reply?

If I reply to a mail in a conversation under a request, my template for the reply doesn't include the timestamp of the mail I am responding to.
I would like the timestamp to be included. Is that possible?

Example:
In a request I have a conversation going with servicedesk@company.com.about a problem they are to correct.
They have sent an email to the request on  2019-02-22 12:30 with the message "Will be fixed shortly. Just hold on!".

Now, over a week later, they still haven't solved the problem and I need to remind them and ask for a status.

In the request-conversation I press Reply and the reply-template throws this up:
----

--- --- ---
Category : Printers
Description :
Hej Andreas. [and the complete text of the conversation]
----


What I want is something like:
---

--- --- ---
Category : Printers
Description :
Sent: 2019-02-22 12:30
Hej Andreas. [and the complete text of the conversation]
----

 
I have checked under notification rules for "Replying to a request" and the template looks like this:
---
$EmailSignature

--- --- ---
Category : $Category
Description : $Description
---

Now, $EmailSignature doesn't seem to do anything, just prints blank. So that I think I can remove. But how do I get the From and Sent fields I ask of? (or something equivalent).
(Maybe I'm not even looking at the correct template? The please advise where I should edit to get this function going)

Also, see screenshot for a visual explanation of what I want.

Thanks in advance!

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