You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, due to bad weather conditions at my destination. Can you please help me to change it?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: Sure, My name is William Evans.

ASSISTANT: Thank you. Please be online for a while. I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: That's Ok, thanks for your service.

ASSISTANT: Welcome William Evans.