You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues.

ASSISTANT: Sure, may I know your name?

USER: Nicole Mitchell.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.