"I am writing to you to express my gratitude to you for helping me to find my grandparents***, who are so kind to me.
Your love and kindness just overfloat and deeply affect people around you. I can feel warm and less lonely because of you. I also feel touched that you try hard to know more about Chinese culture and language. Thank God for bringing you to my life.
Have a nice trip!
I wish you a Merry Christmas."
***Many of the students miss their grandparents back in their home countries so we try to pair them with older persons who can act as pseudo "grandparents" to them.