You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: As part of my schedule, I have to attend a business meeting. But due to some issues the meeting was postponed, can you please change my reservation?

ASSISTANT: Sure, May I know your name?

USER: I am Jason Johnson.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you, Have a nice day.