You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Would you please help me to change my existing reservation on the name of Stephanie Evans?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thanks for opting us, have a good day.