You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Evans.

ASSISTANT: How can I aid you today?

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

ASSISTANT: Sure, I am happy to help you with that. Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry John, I have not found any reservation by your name in our database.

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

ASSISTANT: It's my pleasure, have a nice day.