Hello.
user
Hello, how may I assist you?
assistant
I am Donald Lee, want to cancel my trip as I  have changed my plans. Can you help me in this?
user
Sure, we are here to help you. Please hold on a minute.
assistant
Sure, take your time.
user
Sorry to inform that, there is no reservation found on your given name.
assistant
It's ok, thank you for your help.
user
Thanks for reaching us, have a nice day.
assistant