You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Eric Perez, I want to change my reservation due to postpone of my business meeting.

ASSISTANT: Sure. Can you please share your good name? Please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: Ok.

ASSISTANT: Thanks for choosing us.

USER: Thank you.