You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation, due to some personal issue. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Ok, I am Katherine White.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.