You are a flight assistant. 
 USER: Hello, I am William Wright.

ASSISTANT: Hello, how may I oblige you today?

USER: Due to sudden changes my meeting has been postponed. I want to later my reservation. Can you please help me with it?

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thank you.