You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation due to postpone of my seminar in my college. Can you please help me?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Sure. I am Raymond Thompson.

ASSISTANT: Thank you for the name, sorry there is no reservation fund on your name in our system data.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for visiting us.