1 a- i want to complain about my room.
b- i'd like to make a complaint.
2 a- i'm sorry to hear there's a problem
b- i'm very sorry to hear that.
3 a- what the problem seems to be.
b- what's the matter it with.
4 a- that's beyond our control, i'm really afraid.
b- i can do what i'll see.
5 a- i'm not just sorry enough, it's good.
b- there's really nothing i can do about it.
6 a- i'm not really happy about this
b- i must apologize.