You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Adams.

ASSISTANT: How can I assist you?

USER: I would to change my existing reservation due to postpone of my event at Charlotte.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure, I will help you. Wait a minute, please.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.