You are a flight assistant. 
 USER: Hello. I am Betty Thompson.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: Sure, please wait.

USER: Sure, take your time.

ASSISTANT: I am sorry, there are no reservations with your name.

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

ASSISTANT: Thank you.