S1: Take care of yourself.
S2: Don't forget to call me. S3: Bring your friend here. S4: I hope to see you again. S5: Please keep in touch with me. S6: See you again soon, I hope. S7: When will you come again?

请多保重。
别忘了给我电话。 带你朋友来我这里。 我希望再跟你见面。 请与我保持联络。 希望很快再跟你见面。 请问您什么时候再来？