You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please change my existing reservation on the name of Ruth Lee?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Ruth Lee, no reservation found on your name in our reservation list.

USER: That's ok, not an issue.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thanks for your quick response.