A:Have you confirm hotel?
B:I have’t reserve hotel.And you?
这两句
A:Have you confirmed hotel?
B:I have’t reserved / booked hotel.And you?
B:You are so careful.Which hotel will you stay in?
这句话
B:You are so thoughtful / considerate.Which hotel will you stay in?
更好些
A:I reserve the royal hotel by “booking.com”.
改为 A:I‘m going to reserve the royal hotel by “booking.com”.
其他的都很地道了.不错