"até logo" is used when you expect to see some one again the same day.
"até à próxima" is used if you are not sure when you will be meeting again.
"faz favor" may also be used as "se faz favor ", it means "please".
To express "thank you" a male speaker would use "obrigado" whereas a female speaker would use "obrigada".
To express "no, thanks" or "yes, please", one would use "não, obrigado/a" or "sim, obrigado/a"or "sim, se faz favor" or "não, se faz favor" .