Goodbye Madame and Thank you!

I am a volonteer to read stories in a kindergarden.
Today was the little class, 3-4 years old, last time of the year.
4 groups of +or- 6 boys and girls.
they were nice, always trying to tell their own stories or to disturb the group by crawling on the floor,or moving around..I don't care, and they are disappointed, or I suggest to go back to class without a story (I'm a little sadic..)
When I left, all together gave me this nice bouquet to thank me!
I really did not expect that, and was very touched!
(as yesterday evening I had a big argument with my son, it was nice to get some kindness today!)