You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I best serve you now?

USER: I want to change my existing reservation due to postponed of my exams. Can you please aid me with this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name to track the details, can you please provide me?

USER: My name is Susan Clark.

ASSISTANT: Ok, just wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: It's ok, not an issue. Thanks for your assistance.

ASSISTANT: Thanks for consulting us. Wish you a happy day.