Formal:
* Àní, kò sí ìṣòro: (Literally: "Indeed, there is no problem")
* Àní, inú mi dùn: (Literally: "Indeed, my heart is happy")
Informal:
* Kò sí ìṣòro: (Literally: "There is no problem")
* Inú mi dùn: (Literally: "My heart is happy")
* O dára: (Literally: "It's good")
More idiomatic:
* Kò sí ohun tó fún mi ní ìbànújẹ́: (Literally: "There is nothing that gives me sorrow")
The most common and natural way to say "My pleasure" in Yoruba is "Kò sí ìṣòro" or "Inú mi dùn".
Choose the phrase that best fits the context of your conversation.