You are a flight assistant. 
 USER: Hello, I am Ryan Williams.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my reservation due to my seminar has been preponed.

ASSISTANT: Ok, please wait a minute. I will check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found with your name.

USER: Thank you.

ASSISTANT: Thank you and have a good day.