You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. May I know your name?

USER: I am Dorothy Evans. I want to change my existing reservation due to weather conditions. Could you please help me?

ASSISTANT: Ok, please wait for a while.

USER: Sure,.

ASSISTANT: Much thanks to you for being patience. Sorry for the inconvenience, No reservation is found on this user!.

USER: No issues, Thank you for the information.