Dear Mary,
I am very sorry.I was watching a film with my child in the cinema when you came to my house in the morning yesterday and I didn't come back home untili seven o'clock in the evening.So you must have been disappointed about it.
I hope that you won't leave Guangzhou this week.Please wait for me at the hall of the hotel at nine o'clock on Friday morning.This is you first time to come to Guangzhou,so I will show you around some places you are interested in.
Yours sincerely
Lilu
希望能帮上你喔!