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mistake

1. I'd like to check out, please.
2. I'll check out of Room 102 today.
3. Please send a porter to help me with my luggage.
4. Can we check out just a few hours later?
5. May I extend my stay until next Monday?
6. It's fine, but there is an extra charge.
7. Is there a penalty for late checkout?
8. What's this for? This charge was for your international calls.
9. There must be some mistakes.