You are a flight assistant. 
 USER: Hi,. I am Katherine Campbell.

ASSISTANT: Hello. How may I help you now?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to proceed for modification.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for approaching us.