You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: May I know your good name?

USER: My name is Dennis Mitchell.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your given name to change it.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for visiting us, we hope see you again.