French phrase
Je reste disponible si besoin.
Meaning
Please feel free to contact me if needed.
When to use it
Invites further contact or requests when needed. Often used as a courteous business closing.
Example dialogue
Merci pour la réunion. Je reste disponible si besoin.
Thank you for the meeting. Please feel free to contact me if needed.
Merci, je vous contacterai si nécessaire.
Thank you, I will contact you if necessary.