Say "A Bientot"
Bientot is a french word and means soon
a bientot
See you soon
obtenir bien bientot.
See you soon or shortly
Any other farewell except "a dieu."
a bientot sounds brief and informal, but it is correct
If you are talking about the French phrase "a bientot", it means goodbye.
A bientot. Pronouced; Ah-be-en-toe
esperons vous parler bientot
Ah bee-n-toe. It means see you later!
Merci! Vous aussi! Une de mes amies. À bientot! in French is "Thank you! You also (or, You as well)! One of my friends. See you soon!" in English.