[Lawtan]

Oh, I am here and there, or am I?
*tail begins to disappear*
Hmm...yes that is a conundrum, isn't it, dear?
*back legs are next*
I fear I must tell you...
*Head is the only thing remaining, with the grin still*
We aren't really here...
*disappears*

(On a serious note: you can't change the past. What matters is if you chose to recontact the person in the present)