You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: Anthony Clark here. I need to change my recent reservation because my trip dates are postponed.

ASSISTANT: Sure, I will help you with that Clark.

USER: Thank you.

ASSISTANT: Sorry to say this Clark, there are no active reservations with your name.

USER: It's ok, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching out here.