how to say good-bye?

　　section a
　　steven：well. i have an appointment now。
　　lily：i'm in quite a hurry too。
　　steven：good to see you. goodbye。
　　lily：goodbye. take care of yourself。
　　section b
　　lily：i guess i'd better go now。
　　steven：i've got to be going now too。
　　lily：in that case, i'll be seeing you。
　　steven：so long. see you later。