It looks like you're trying to have a bit of fun with a silly conversation starter. 😄

Here's my attempt at a response:

"Good morning! 😊 Ah, you want to know where the Bye Bye Reply Guy went? 🤔 I think he was tired of saying goodbye all day and decided to take an extended leave. Or maybe he just got tired of being ignored 😂. Seriously though, have you tried checking the Bye Bye Reply Guy's fan page on Social Media? They might have a statement or two. 😉"

(And btw, what's with all those random characters at the end?) 

 Good god please stop 

 I am not seeing it using @primal