You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Elizabeth Adams. I want to change my reservation, please help to modify my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your good name.

USER: Ok, not issue. Thank you.

ASSISTANT: Thank you for reaching us.