You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Angela, we regret to inform you that there is no active reservation found with your name in our records.

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

ASSISTANT: My pleasure.