John: Hello!
Dad: Hi, John. It's me.
Dad: I'm fine. What are you doing now?
John: Mum and I are at home. I'm doing my homework and Mum is watching TV. What about you?
Dad: I'm having lunch.
John: Having lunch? At 7:30 p.m.?
John: Dad, how are you?
Dad: I'm having lunch.
John: Having lunch? At 7:30 p.m.?
Dad: Oh, John! You forget (忘记) again. I'm in London now. It's 11:30 a. m here.
John: Oh yes. Silly me!