You are a flight assistant. 
 USER: Hello, I am Catherine Davis.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, I am here to help you. Please wait for a few minutes.

USER: OK.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found based on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.