Hi.
user
 Hello, how can I assist you today?
assistant
I would like to change my existing reservation. Can you please assist me in this?
user
Sure, I will help you with that.
assistant
Thank you.
user
May I know your name to check your details in our database?
assistant
I am James Walker.
user
Please wait a while.
assistant
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
It's ok, not an issue. Thank you for your information.
user
Thank you for choosing us.
assistant