Conversation:

A: Hello, Mrs summers. This is Mrs Lee. John hasn't come home yet, and I'm getting a little concerned. What time did he leave there?

B: About an hour ago. But I wouldn't worry too much. You know how boys are.

A: Yeah, I know. But it usually only takes him thirty minutes to walk home.

B: Maybe he stopped off at a friend's house.

A: Yeah. Maybe you're right...Oh, wait. I think I hear the door opening now.

This is→sɪ

and I'm→daɪ

about an hour ago→də;naʊə;rə

but it→dɪ

stopped off→dɔː

at a→də