ai adjectives in Japanese become long o in honorifics
examples
hayai becomes hayo^ gozaimasu or hayou gozaimasu thus when someone says o-hayou gozaimasu we are really saying it is honorifically fast or good-morning
abunai - goes to abuno^ gozaimasu
mijikai - goes to mijiko^ gozaimasu
semai - goes to semo^ gozaimasu
chisai - goes to chiso^ gozaimasu -