What happened when the man was out?

W: Good afternoon.Mr.Burke. Did you have a good lunch?
M: Yes,thank you,Miss Ventner.It was very good.Did anyone phone while I was out?
W: No, nobody phoned,but...er...Mr.Cooper came.
M: What?But he’s the man I told you about!
W: Yes,I know,He came in for something urgent.He said he wanted to see you right away,but...
M: Well,then,why didn’t you phone me?We all know that Mr.Cooper has some very important information.I wanted to talk to him as soon as possible.I told you all that before I left.Didn’t you understand me?
W: Yes,of course,I understood you,Mr.Burke,but...
M: I even gave you a card with the name and phone number of restaurant!I put it on your desk.
W: But that’s just it!You didn’t give me the card.You didn’t put it on my desk!
M: What do you mean?Of course I did.I took the card out of my wallet just before I went to lunch! Look!It isn’t in my wallet now I! OH!
W: Mr.Burke,what’s that card on the floor?It fell out of your wallet a second ago.
M: That card?It’s...er...it’s the card I thought I gave you.
W: You see!You forgot to give me the card!That’s why I didn’t phone.I didn’t know where you were having your lunch.
M: No,of course you didn’t.I’m very sorry,Miss Ventner.It wasn’t your fault.I apologize.
W: That’s all right.Please forget it.