You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Owning to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: May, I know your good name?

USER: Myself John Thompson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT:  Sorry, we found no reservation on your given name.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.