You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Anna Allen, I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, hold on a moment I will be back.

USER: Ok.

ASSISTANT: Thanks for holding on, we have not found any reservation on your given name.

USER: No problem, thanks for your service.

ASSISTANT: Thanks for choosing us.