1. I"m sorry for being late.
2. I"m sorry to have kept you waiting.
3. Sorry, I"m late again. I"ll make it up to you. Dinner is on me. How"s that?
4. Sorry, I didn"t catch the bus. / I missed the bus.
5. Sorry, I hit rush hour traffic.
6. Sorry, I overslept this morning.
7. I know it might sound lame, but my alarm clock somehow didn"t go off this morning.
8. Sorry, I was delayed by a last-minute meeting.
9. I forgot my wallet at home, so I went back for it. That"s why I"m late.
10. I got stuck in traffic. I tried to call your mobile phone, but it was busy.