Flight check-in question

Go to check in counter, inform (tell) the CS (counter customer service) that a minor of 13 years old (boy or girl) will on board by himself (or herself), they will arrange air stewardess to take your child to go through security and immigration. Upon arrival to the destination, the air stewardess will take your child go through the customer and immigration, then take your child to arrival gate and wait from your designated personnel to pick up your child. But you have to provide all the information of the person who pick up your child, they won't allow stranger to pick up your child. The stewardess will taking care your child all the way from HK to your destination, but you have to request this at check in counter, they will make arrangement.

you both check in, ok?

How can I check-in for my 13 years old children?
adult's requirement is applied.