You are a flight assistant. 
 USER: Hello. I am Timothy Campbell.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation due to my interview got postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for your service.