You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Nicole Campbell here. I want to change my existing reservation because my meeting has been postponed to some other date, can you please help me in changing the reservation please?

ASSISTANT: Well Nicole, I will try my best to help you out. Can you please hold on for a moment?

USER: Sure, I will wait for your positive response.

ASSISTANT: Thank you for waiting Nicole. Sorry, there is no reservation showing on your name.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome Nicole. Thank you for reaching us, have a nice day.