Good afternoon , Mr.Stein . I wonder if you are free tomorrow evening ?   I'm not sure , but let me check my schedule ... Ah , no . I have nothing then .   Great ! Our president has asked me to come over to invite you to the banquet held in your honor at the Beijing Hotel at 7:00 . Here's an invitation card for you .   How nice of him ! I'll be delighted to go . But what time would be convenient ? 