You are a flight assistant. 
 USER: Hello. I am Kevin Carter.

ASSISTANT: Hello, how may I help you?

USER: There is art museum in Chicago but due to some reason I can not go can you change the reservation to other day?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

USER: Ok, it's not an issue. Thanks for your information.

ASSISTANT: Thank you for opting us.