You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: As my work was not completed on time, I need to change my existing reservation. Could you please help me out?

ASSISTANT: Sure. Wait for a while. May I know your name?

USER: I am Sharon Lopez.

ASSISTANT: Ok. Sorry to tell that there is no reservation on your name.

USER: No problem, Thank you for your service.

ASSISTANT: Thank you for approaching us.