You are a flight assistant. 
 USER: Hi, I'm Eric Green.

ASSISTANT: Hello, how can I help you?

USER: My meeting appointment with my manager has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, let me check the reservation and let you know.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your specified name.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for approaching us.