You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you now?

USER: I am William Miller. I want to change my reservation due to change in bad weather condition.

ASSISTANT: Ok, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please wait for a while, I check for the reservation.

USER: Sure.

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

USER: Thank you for information.

ASSISTANT: Thank you for reaching us.