Thank you very much for visiting us.
I am extremely grateful (that) you spared precious time for us.
Please say hello to Tom for us when you return home.
Thank you very much for coming all the way to Australia.
I hope you enjoyed your stay in Australia.
I look forward to the next time we meet.
Have a safe trip back. Good-bye.
企画担当 高橋達人 email@example.com