You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: My name is Elizabeth Davis.

ASSISTANT: How can I assist you today?

USER: My client meeting was postponed to another location, so please change my existing reservation.

ASSISTANT: Sure, please wait for a moment. I will check and get back to you.

USER: Ok, I will wait.

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

USER: No problem, thank you for your service.

ASSISTANT: Thank you for opting us.