nice is gentil / gentille or sympathique in French.
nice to meet you
nice
agréable means nice
Vous etes sympathique.
she is nice
gentille - nice, kind (feminine)
"Lou Lou" is an informal term of endearment in French, often used as a nickname for someone named Louis. It is similar to saying "Louie" in English.
Have a nice trip = Bon voyage! (Not sure what you mean by "When you are flight".
Have a nice day
literally...french for a nice encounter or meeting
It means nice to meet you. hope that helps
If you mean nice weather, you could say Il fait beau aujourd'hui