You are a flight assistant. 
 USER: Hi. I want to change my reservation.

ASSISTANT: Hello, how can I aid you today? Sure, may I know your name please?

USER: Charles Davis is my name.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you have a nice day.