You are a flight assistant. 
 USER: Hi. Michael Nelson here.

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

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Michael Nelson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Not a problem. Thank you.

ASSISTANT: Thank you for approaching us.