You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, may I know your good name?

USER: I am Virginia Green. Please change my existing reservation.

ASSISTANT: Ok, please wait. I will check your reservation.

USER: Sure.

ASSISTANT: Sorry, we couldn't find any active reservation on your name.

USER: Thanks for the assistance.

ASSISTANT: Thanks for consulting us, have a nice day.