Hi.
user
Hello. How can I help you?
assistant
I want to do some correction to my recent reservation, can you please assist me with that?
user
Sure, I will help you to change your reservation. Please mention your name to check your previous reservation.
assistant
Myself,  Andrew Smith.
user
Sorry, no reservation found on your name to change your reservation.
assistant
That's ok, thank you for checking.
user
Welcome, have a nice day.
assistant