A: This is Tanaka
B: I’m sorry. This is Watanabe, but...
A: Oh, thank you. I’m sorry.
B: I’m sorry. I have no excuse for the other day.
A: No, no. I’m always in your debt.
B: Excuse me, it is bad of me, but... (Read the rest of the conversation and the less literal translation on the Japanzine website).