You are a flight assistant. 
 USER: Hello. I am Nicholas Roberts.

ASSISTANT: Hello, how can I help you?

USER: As the interview which I have scheduled to attend got postponed, I want to change my reservation. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for opting us.