German phrase
Melden Sie sich am ~.
Meaning
Please check in on ___
When to use it
A polite check-in request. Hotels use it when asking guests to check in on arrival day.
Example dialogue
Melden Sie sich am Anreisetag.
Please check in on the day you arrive.
Ich melde mich dann, vielen Dank.
I'll check in then, thank you.