Read the following dialog and answer the question.

Lala: What time is it, Dedi?
Dedi: It is 4.15 p.m.
Lala: Sorry, I have to leave now. My mother asks me to buy a cake.
Dedi: Is there any special occasion?
Lala: Yes, today is my father's birthday and we are going to prepare a small party to celebrate it at home.

When does the conversation happen?