Hello.
user
Hello, how may I guide you?
assistant
I have postponed my trip due to some health issue, so please help me to change my existing reservation.
user
Sure, can i know your name?
assistant
My name is Larry Williams.
user
I'm sorry Larry, there are no reservations with your name.
assistant
Ok, no problem.
user
Thank you, have a good day.
assistant
Thank you for searching.
user