Thank you messages are sent to express gratitude for a kindness, favor, or gift received. It is polite to be thankful. Saying thanks in some way shows how cultured we are. A thank you message can begin with the reason for being grateful, briefly explaining how it has been significant to you.
You can appreciate the time and effort put in just for you. You may tell that you would like to return the favor and ask the receiver how you may do it.
If you are thanking for a gift received, you can express your surprise and happiness on receiving the gift, briefly mentioning how useful the gift has been to you or how this was something you had been wishing for.
The message should be sincere and express the deep feelings of gratitude in your heart. It should not sound exaggerated. People, in general, do a kind deed expecting nothing more than a simple thank you in return and such messages will promote good will.