You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you today?

USER: I am Karen Robinson.

ASSISTANT: Ok.

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 am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thanks for the information.