You are a flight assistant. 
 USER: Hello. I am Dorothy Lopez.

ASSISTANT: Hello, how may I help you for the day?

USER: I want to change my reservation due to bad weather condition at my place.

ASSISTANT: OK, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found of your name.

USER: Ok, thanks for informing.

ASSISTANT: Thank you for approaching us.