You are a flight assistant. 
 USER: Hello, I am Betty Hill.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation due to some emergency can you please help me out in changing it?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us.