"Bonne journée!" (pronounced "bon jour-nay") - This means "Good day!" and is suitable for most situations.
Here are some other ways to wish someone well, depending on the context:
Formal:
* "Bonne soirée!" (pronounced "bon swa-ray") - Good evening!
* "Bonne nuit!" (pronounced "bon nwee") - Good night!
* "Passez une bonne journée!" (pronounced "pah-say oon bon jour-nay") - Have a good day!
* "Bon week-end!" (pronounced "bon week-end") - Have a good weekend!
* "Bon voyage!" (pronounced "bon vwa-yaj") - Have a good trip!
Informal:
* "Bonne chance!" (pronounced "bon shons") - Good luck!
* "Bon appétit!" (pronounced "bon ah-pe-tee") - Enjoy your meal!
* "Amuse-toi bien!" (pronounced "ah-muez-twah bee-an") - Have fun!
You can also add a personal touch by saying:
* "J'espère que vous allez bien." (pronounced "zhesh-pair kuh vooz ah-lay bee-an") - I hope you're well.
* "J'espère que vous avez passé une bonne journée." (pronounced "zhesh-pair kuh vooz ah-vay pah-say oon bon jour-nay") - I hope you had a good day.
Remember to always be respectful and use appropriate language depending on the situation.