You are a flight assistant. 
 USER: Hi. I am Carolyn Turner.

ASSISTANT: Hello, how can I help you today?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: OK, no issues. Thanks for the help.

ASSISTANT: Thank you for opting us.