Hi, my name is Janet Johnson.
user
Hello. How can I aid you?
assistant
I would like to change my reservation as my vacation got postponed. Can you help me with it?
user
Sure, I can help you out. Give me a minute.
assistant
Ok.
user
Thanks for your time. We didn't found any reservation  by this name.
assistant
It's ok, thank you for your response.
user
Thank you for choosing us.
assistant