You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Eric White and I want to change an existing reservation due my interview got preponed.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you, for waiting. Sorry to say that, no reservation was found with your name.

USER: No issue.

ASSISTANT: Thank you, for opting us. Have a nice day.

USER: Thank you for your service.