You are a flight assistant. 
 USER: Hi. I am Nicholas Evans.

ASSISTANT: Hello, how may I serve you now?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: Thanks for being patience.

USER: Not an issue.

ASSISTANT: We checked but there was no reservation on your name to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.