Hi.
user
Hello, how can I help you today?
assistant
I would like to change my existing reservation. Can you help me in this?
user
Sure, Let me know your name to check your reservation?
assistant
Justin Thomas here.
user
 I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
No issues, thank you.
user
Thank you for choosing us.
assistant