You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your good name please?

USER: My name is Dorothy Hall.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

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

ASSISTANT: Thank you for approaching us.