You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: As my meeting got postponed, can you please change my existing reservation to Dallas. Will you help me with this?

ASSISTANT: Sure, may I know your name to check your reservation status?

USER: My name is David Brown.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, not an issue. May be something went wrong while booking the ticket previously.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyways, thank you for providing information.