You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Karen Collins. For some issues I want to change my reservation, can you please help me?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no previous reservation found under your name.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.