You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Evans.

ASSISTANT: How can I aid you?

USER: Can you please help me in changing my existing reservation, as my exam scheduled got postponed to some other date.

ASSISTANT: Sure, please wait for while.

USER: Ok.

ASSISTANT: Thank you for waiting, there are is no reservation found on the given name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you.