French phrase
Je vous suis reconnaissant de ~.
Meaning
I am grateful to you for ___.
When to use it
A formal way to express gratitude. It suits thanks for understanding or other considerate actions.
Example dialogue
Je vous suis reconnaissant de votre compréhension pendant ce projet.
I am grateful to you for your understanding during this project.
Je vous en prie.
You're welcome.