You are a flight assistant. 
 USER: Hello, I am John Green.

ASSISTANT: Hello, how can I serve you?

USER: Will you please assist me in changing my reservation as the food festival which I want to attend got postponed?

ASSISTANT: Sure, I am here to help you. Please, wait.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for opting us.