I left in such a hurry that I didn't have time to say good-bye to you.

临行匆忙，未能向你告别。

《新英汉大辞典》

Please say bye-bye to you Mummy (Daddy).

请向妈妈（爸爸）说再见。

youdao

I come here only to say good-bye to you.

我来只是向你告别的。

youdao

Good bye to you,Giovanni."

VOA: special.2009.05.30

I'll be saying good-bye,Ranse that is,if you want to."

VOA: special.2009.11.14

So wave bye-bye to everything you knew and set out as you would for a good holiday.

BBC: NEWS | UK | Magazine | Advice for dads? Work it out yourself

You may have a lot to save before you can say good bye to the working world, but at least it's a start.

FORBES: Early Retirement Is Not Just A Daydream

Just don't be surprised when you want to cry yourself a river as you say Bye, bye, bye to this sexy boutique hotel.

BBC: Daily deal: Atlantic City glamour