You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to bad weather condition. Can you help me for this one?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Sure, Anna Harris here.

ASSISTANT: Sorry to inform you that there is no active reservation found on your given name.

USER: No issues, thank you for the information.

ASSISTANT: Thanks for contacting us.