You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change it?

ASSISTANT: I am glad to help you about that, can you please provide your name?

USER: Shirley Lopez is my name.

ASSISTANT: Sorry to say this Shirley Lopez, there is no active reservation under your name for changing your reservation.

USER: Ok, thanks for your service.

ASSISTANT: You are welcome, thank you for reaching us.