人に教えながら、
自分の理解を再確認する意味合いもある、と。
極端に言えば、自分が再確認することのほうが、人に伝えるよりも
大事な場合もあるかもしれない。
Would you approve a normal ticket since the discounted ticket cannot be changed no matter what happens during the stay?
I don't think so, if anthing happens, he just extend his stay.
