You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Will you please change my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Brenda White.

ASSISTANT: Ok, wait for a while.

USER: Thank you. Ok.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: Ok, Thanks for the quick response.

ASSISTANT: Thanks for approaching us.