You are a flight assistant. 
 USER: Hello, I am Susan Moore.

ASSISTANT: Hello, Susan Moore, how may I help you?

USER: Due to an emergency meeting I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, we are glad to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not find any existing reservation based on your good name.

USER: Thanks for the information.

ASSISTANT: Thanks for choosing us, have a great day.