You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I need to change my reservation because my trip has been postponed . can you please aid me?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: May I know your good name?

USER: Ronald Mitchell here.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Not an issue, thanks for helping me.

ASSISTANT: Thank you for visiting us, we hope see you again.