A request concerning the bento lunch: the quantity of rice
Model
From the school
From the home
Conversational flow and useful expressions
Greeting
Expressing understanding
What you will do
Closing
Parent's name
Supplement
Although 「おはようございます」(ohayo gozaimasu), or “good morning”, is an acceptable greeting, since your child’s teacher is making a suggestion based on his/her concern for your child, you may instead want to use「いつもありがとうございます」(itsumo arigato gozaimasu), meaning “as always, thank you”, or 「いつもお世話様です」 (itsumo osewa sama desu), meaning “as always, thank you for your support”.