You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Nicole Collins, help me to change my reservation as my plan to meet my family family is postponed.

ASSISTANT: Sure, I am glad to help you, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Collins, no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.