What are the two speakers talking about?

M: Hi, Susan. How are you? I’ ve been wondering when I’ d run into you. What are you busy with?
W: Nice to meet you here, Tim. I’ m buying some Christmas gifts for those who work with me, but it’ s really a headache.
M: Maybe I could give you some advice. Firstly, you’d better divide them into different groups—who were the people that are your friends as well as your workmates and who are the people you do not know well but you see pretty much daily.
W: OK, then what should I do?
M: For the friends, you want to get them personal gift. Do they like chocolate?
W: This is what I always give, but I know Mary is on a diet.
M: Does she like fruit or coffee? Anyway, think of the gift that you know your friend likes.
W: Well, I think fruit is helpful to keep fit. What about the rest of them?
M: Leave cards in their mailboxes or on their desks.
W: Christmas cards?
M: Yes, you can afford that. More importantly, it’ s true of them that you’ re thinking of them.
W: Thank you for your suggestion, Tim. You really have saved me and my money as well.