See you later
Arrivederci is a common departing phrase in Italian. It's often used when saying goodbye and you expect to see the person again in the future. Although it literally translates to 'until we see (each other) again', it's commonly used in the same way as 'see you later' in English.
Goodbye, I hope to see you soon.
In this phrase, the speaker is expressing a desire to see the other person again in the near future after saying goodbye.
Goodbye, my beautiful lady.
This phrase is a more formal or affectionate way to say goodbye to a woman, possibly someone the speaker knows well or finds attractive.
I said 'Goodbye' to my friend before leaving.
This sentence is describing an action in the past where the speaker said goodbye to a friend before they departed.