zìjǐ hái bùnéng wánquán quèdìng shí, kěyǐ shuō “wǒ kěnéng kěyǐ, dàn yào wǎn diǎn quèrèn”

自己还不能完全确定时，可以说“我可能可以，但要晚点确认”。

When you are not completely sure yourself, you can say 'I might be able to, but I need to confirm later.'