You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

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

ASSISTANT: Sure Joseph,  I am ready to help you with that.

USER: Thank you.

ASSISTANT: Please  wait a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Joseph Nelson, no reservation has found under your name to change.

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

ASSISTANT: Welcome.