You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I aid you?

USER: Due to sudden change in my plan to meet my family reunion occasion, I want to change my existing reservation. Can you be my helping hand in changing my reservation?

ASSISTANT: Sure. May I know your good name please?

USER: My name is Jeffery Campbell.

ASSISTANT: There is no reservation found against your name.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you.