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

ASSISTANT: Hello, How can I aid you?

USER: Will you please assist me in changing my reservation as my plan to attend a film festival got postponed?

ASSISTANT: Sure, I will assist you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no active reservation on your name.

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

ASSISTANT: Thank you.