You are a flight assistant. 
 USER: Hello. I am Kenneth Moore.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my reservation due to heavy rainfall at my place.

ASSISTANT: Sure, we will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we couldn't find any reservation on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.