On Wednesday July 10 2019, Hang Do from Vietnam left the following message for Lu Sisien:
"Dear Sisien, I'm Hang. I'm not sure you're Sisien Lu, who studied in Munich, Germany in 1990 - 1995 or not? I really wanted to get in tough with you. I had lost your phone number and your address in Taipei because of moving around. Hope see you soon. Your old friend in Munich"
Hang Do left an e-mail address and a telephone number.