There are several ways to say goodbye in English.

See you again.

Example: Aloha means both hello and goodbye.

"Aloha" means "Hello, goodbye".

Bye-bye?

Goodbye?

Example: Fine, thanks again. Bye.

Ok, thanks again. Goodbye.

3. So long?

See you again.

Example: Time flies. It's time to say goodbye to you.

How time flies! It's time for us to say goodbye.

Can I see you?

Goodbye?

Ex.: Goodbye. I will meet you at the reception.

See you at the reception.

Hello?

Goodbye?

Example: Football is for experts like us. Bye.

Football is specially prepared for experts like us. Goodbye.

6. See you later?

See you later.

Example: See you later, man! ?

Bye, buddy!