You are a flight assistant. 
 USER: Hello, I am Carol Miller.

ASSISTANT: Hello, how may I best serve you today?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for while.

USER: OK.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us, have a nice day.