Hi. Margaret Clark here.
user
Hello, how can I assist you?
assistant
Can you cancel my flight ticket reservation? As I have postponed my business trip to Atlanta.
user
Sure, please provide your name to fetch your ticket  from our database.
assistant
I am Margaret Clark.
user
We regret to inform you that there is no active reservation found on your name.
assistant
Not a problem. Thank you.
user
Thank you for contacting us.
assistant