Hello.
user
Hello, how may I help you?
assistant
I want to change my existing reservation as my trip dates has been postponed. Can you help me with that?
user
Sure, I am here to help you. May I know your name?
assistant
Thank you. I am Mary Hall.
user
I am sorry to say you that there is no reservation found under your name in our database.
assistant
Ok, no problem. Thank you for your information.
user
You are welcome and have a nice day.
assistant