Formal:
* Puis-je vous aider? (Pwee-jay voo eh-day) - This is the most formal way to offer assistance.
Informal:
* Puis-je t'aider? (Pwee-jay teh-day) - This is a more casual way to ask if you can help someone, using the informal "tu" form.
* Est-ce que je peux t'aider? (Ehs-kuh zhuh peuh teh-day) - This is another informal option, using the verb "pouvoir" (to be able to).
In a shop or other service setting:
* Y a-t-il quelque chose que je peux faire pour vous? (Ee-ah-tee-eel kelk shohz keh zhuh peuh fair poor voo) - This translates to "Is there anything I can do for you?"
Choose the most appropriate phrase based on the formality of the situation and your relationship with the person you're speaking to.