Hello , Mr.Green . This is Lin Tong . How are you ?   Hi , Mr.Lin . I am leaving tomorrow and I am just packing .   Oh , sorry to interrupt you . But I am calling to say goodbye to you . I am awfully sorry to tell you that I am afraid I could not see you off at the airport tomorrow , because I will have to attend a very important meeting .   It doesn't matter , Mr.Lin . I can understand . I know you are always very busy . Work must come first .   Thanks a lot . You have been here for almost three weeks . How time flies !   Yes . And I would like to convey my thanks to you for your help during my stay here in Nanjing .   It is our pleasure . It has been a great pleasure to work with you .   Me too . I am looking forward to cooperating with you again . 