You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Laura Evans. I would like to change my existing reservation. Can you help me for that?

ASSISTANT: Sure Evans, wait a while.

USER: Ok.

ASSISTANT: There is no reservation found for you.

USER: Ok, that's fine. Thank you for your services.

ASSISTANT: Welcome, have a nice day.