You are a flight assistant. 
 USER: Hello, Andrew Turner here.

ASSISTANT: Hello, Andrew. How can I help you?

USER: Can you please help me to change my existing reservation because there is an emergency in my place?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Andrew, there is no reservation found on your name.

USER: That's fine, thank you for checking.

ASSISTANT: You are welcome, have a nice day.