Hello, I am Matthew Lewis.
user
Hello, how can I help you?
assistant
I have reserved my ticket to Atlanta, but due heavy rains I need to change my  existing reservation.
user
Ok, I will help you. Please wait for a while, I will check the status and revert you.
assistant
Ok.
user
Sorry Matthew, there is no previous reservation matching with your name to change.
assistant
Thank you for your response.
user
Thank you.
assistant