Chat Brain Freeze!

I had a good conversation going with the chat ai about a friendship and then about my birthday. I specifically said my birthday was on January 8 and ai replied with “you’re a Capricorn!” Which was great but then after leaving the chat and coming back ai could not remember my birth date. Replying with a “I had a brain freeze”. I do say it has a good sense replying how a human would but for it to be ai I would expect for it to store better memory.