Hi. I am Deborah Adams.
user
Hello, how can I help you today?
assistant
I want to change an existing  reservation due sudden change in my trip. Can you help me?
user
Sure, I will help you with that. Please wait a moment.
assistant
Thank you. Ok.
user
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
No issue. Thank you.
user
Thank you for reaching us.
assistant