If the opportunity to say thank you presents itself, take it!
When someone has done an act of kindness for you,
it most certainly should be acknowledged.Thank you note wording is a polite and kind way of showing your appreciation. It lets the receiver know that you value them. It also gives value to you as a person as well.
It is not the size of the act or gift that matters, it's the deed itself that does. By nature we love to receive gifts. A thank you note is a gift too. When we communicate in that way we are bonding with one another and possibly creating new friendships. One important thing to remember is no one can ever know what is really on your mind unless you tell them and thank you note wording does exactly that!
A thank you note is personal. What you are expressing to them should be true feelings that come from your heart, which is also a gift of gratitude. To write thank you note wording only takes a small amount of time from your day when you think about it. Just consider that time well spent in comparison to what was given to you. If you have received kindness today, remember to say Thank You!
From Thank You Note Wording ~ The Blog

