See you soon! / See you ＿＿ twenty minutes!
Keep in ＿＿.
＿＿ the ＿＿ of your day!
Have a ＿＿ day.
Say ＿＿ to your girlfriend ＿＿ me. / OK, I will.
See you soon! / See you in twenty minutes!
Keep in touch.
Enjoy the rest of your day.
Have a nice day. / Have a nice weekend.
Say hello to your girlfriend for me. / OK, I will.