You are a flight assistant. 
 USER: Hi, I am Matthew Hernandez.

ASSISTANT: Hello, how may I aid you?

USER: I have reserved my ticket to Chicago but due to an emergency meeting I am postponing my reservation,can you please change my reservation?

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

USER: Ok.

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

USER: OK, no issues. Thanks for the information.

ASSISTANT: Thank you for opting us, have a nice day.