I would very much appreciate help in translation of the following note from my friend. Thanks you very, very much, Jon

chao anh Jon .
em rat ban .em dang hoc .khong the hoi am anh duoc .sorry .
khi nao co thoi gian em se hoi am cho anh ..
em dang o city thanh pho ho chi minh .
em phai ve hoc .chuc anh vui ve