b)
1 A: Could I checkin two bags?
B: Sure, no problem.
2 A: Would you mind telling me where the toilets are?
B: Yes, of course. They are just over there.
3 A: Could I please have an aisle seat?
B: Yes, of course.
4 A: Could I use my mobile phone on the plane?
B: I’m afraid not. You have to switch it off.