You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Carol Lee. I want to participate for a seminar at my destination, due to some issues the seminar has been postponed. Can you be my helping hand to change my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Ok, no problem. Thanks for your help and support.

ASSISTANT: Thanks for choosing us.