"I am well, and you?"
Say "Adiós" in response. It means "Goodbye".
"Merçi!"
pleasure
When some says "wassup" you would reply as if someone asked you " what's up."
A smile and a heartfelt "Thank you".
and the rest of the day to you
You could say, "I'll try."
If someone says sup in chat then the reply is usually nuttin. Sup is short for whats up
The most appropriate reply would be "Thank you."
You answer with xoxo back. xoxo are kisses i think .
To reply to hasta mañana, you could use the same phrase or vary it: Nos vemos, Hasta luego, Adios.