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.

ASSISTANT: Sure, may I know your name?

USER: My name is Karen Carter.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no ticket showing on your name.

USER: That's ok, thank for checking.

ASSISTANT: Thank you for connecting with us..

USER: Welcome.