Employer's automated text message: "Come to the shift? Reserve the shift with code'Reserve X1'."
Me:
"Reserve X1"
"Now we only need to wait for confirmation. Or other notification of the shift being taken."

Cell phone:
*As mute as fish*
No new messages, LOL!
"Hmph!"
After half an hour:
"Mia K. here, hello...
About that shift, because it was never confirmed or denied. No... Oh, it got taken already?
Sorry, I can't go to Rajamäki. Thanks anyway.
Bye!"
After two hours:
*typetypetype*
Emplyer's automated message: "The shift, you tried to reserve, has been filled already."
"...Thanks, I am aware."