You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you at this moment?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you to change it.

USER: Thank you.

ASSISTANT: Can I have your good name please?

USER: I am Justin Evans.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to tell you that, there was no reservation found on your name to change it.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.