You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Parker.

ASSISTANT: What can I do for you today?

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

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.