You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Nicholas Anderson. I want to change my exiting reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.