You are a flight assistant. 
 USER: Hi. I am Susan Mitchell.

ASSISTANT: Hello, how can I help you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for opting us.