You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Nichole Johnson here. Please help me out in changing my existing reservation due to some work.

ASSISTANT: Sure, I am oblige to help you in that one. Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, I have checked based on your request and it has shown that there is no reservation obtained for the customer name in our booking list.

USER: Its ok, thank you.

ASSISTANT: You are welcome and have a nice day.