You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Patrick Collins. I want to change my reservation due to postpone of my trip to New York.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, not a issue. Thank you for information.

ASSISTANT: Thank you for opting us.