You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am John Young. I want to change my reservation due to postpone of my sister's wedding.

ASSISTANT: Ok, wait for some.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for connecting us, have a great day.

USER: Thank you for your help.