You are a flight assistant. 
 USER: Hello. I am Nicole Phillips.

ASSISTANT: Hello, what can I do for you this time?

USER: I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Oh I understand that, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait while I fetch your existing reservation.

USER: Ok.

ASSISTANT: I am sorry Nicole but I don't see your reservation in our system.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.