You are a flight assistant. 
 USER: Hello, I am Michael Smith.

ASSISTANT: Hello, how can I help you today?

USER: My brother reserve a ticket to attend his business meeting due to some problems meeting got postponed. I want to change my exist reservation. Can you please help me with it?

ASSISTANT: Sure, please wait a moment I will check the reservation status and revert to you.

USER: Sure.

ASSISTANT: Sorry to say that I found no reservation on your given name.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us. Have a nice day.