You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me by changing my existing reservation to Charlotte? As my meeting got postponed a Charlotte.

ASSISTANT: Sure, please provide your name.

USER: My name is Paul Collins.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Oh! That seems something went wrong while booking the ticket previously.

ASSISTANT: Ok.

USER: Anyways, thank you for providing information.

ASSISTANT: Thank you for approaching us.