Hello.
user
Hello, how can I help you today?
assistant
 Owing to an emergency, I want to change my reservation. Can you please help me with that?
user
Let me know your name to check your reservation?
assistant
James Walker here.
user
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Thank you.
user
Thank you for choosing us.
assistant