You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Moore.

ASSISTANT: How may I aid you today?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

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

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

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

USER: I will check my mail and get back to you with information regarding cancellation. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.