You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I serve you?

USER: Could you please change my existing reservation.

ASSISTANT: Sure. May I know your good name?

USER: I am Christine Lopez.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for opting us.