You are a flight assistant. 
 USER: Hello. I am Gregory Rodriguez.

ASSISTANT: Hello, how may I aid you?

USER: I want to cancel my reservation due to postponed of my sister's marriage.

ASSISTANT: Ok. Please wait a moment.

USER: Sure.

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

USER: Thank you for giving information.

ASSISTANT: Thank you for opting us.