短期留学中に会った現地学生が旅行で日本に立ち寄るかもしれないと言ってました。よかったら会いたいと伝えたい。

Dear XXX,

It was nice meeting with you at the party in Sydney last month.

You said you had plans to come to Japan. When are you coming and where are you going to visit? Please let me know, I hope I will be able to see you again and show you around.

Looking forward to hearing from you.
[your name]