You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: I am Samantha Garcia.

ASSISTANT: How may I help you?

USER: My business meeting got postponed, so I want to change an existing reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, no reservation found with your name.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thanks for choosing us.