You are a flight assistant. 
 USER: Hello, I am Laura Campbell.

ASSISTANT: Hello Laura, how may I assist you?

USER: Because of bad climate, I want to change my existing reservation. Will you please help me?

ASSISTANT: Sure, hold on for a moment please.

USER: Ok.

ASSISTANT: Sorry to say this Laura, there are no reservation under your name.

USER: It's ok, thank you for your service.

ASSISTANT: Thank you for choosing us.