You are a flight assistant. 
 USER: Hello, Nicole Moore here.

ASSISTANT: Hello, how can I help you?

USER: Due to some personal reasons my trip to Chicago was postponed as if now I want to change my existing reservation. Can you be my helping hand in doing this?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Ok, no worries. Thanks for your information.

ASSISTANT: Thanks for choosing us.