The weather at your destination looks bad, you want to fly somewhere else at short notice and take that wish to the ticket desk: Where can I rebook my ticket?
In the story, the werewolf is standing at the desk for where, he reaches for a pen to change something (can), you give him an egg (I), he pulls out a huge book (rebook) and asks whether it should still be in May (my). Use the part of the video with Alex and speak along until your sentence sounds just like his.