You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Jennifer Roberts.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. We could not found any reservation on your name in our database.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you.