You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emily Nelson.

ASSISTANT: How may I aid you today?

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

ASSISTANT: Sure, I am glad to help you out. Please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Emily Nelson, there is no flight in your route with your travel dates.

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

ASSISTANT: No flight reserved on your name. Thank you for reaching us.