You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have reserved a ticket from LGA to MOC, there is bomb blast in MOC so I want to change my existing reservation.

ASSISTANT: Sure, can I know your name please?

USER: My name is Elizabeth Young.

ASSISTANT: Sorry Young, there is no reservation found on your name.

USER: It's ok, thanks for helping me out.

ASSISTANT: Thank you for reaching us, have a good day.