You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself John Jones.

ASSISTANT: How can I help you John?

USER: As my meeting got postponed, I would like to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I will help you with that. Please wait for a while. Sorry Jones, there is no reservation found under your name.

USER: Take your own time. Ok, not an issue. May be something went wrong while booking the ticket.

ASSISTANT: My pleasure, have a nice day.

USER: Thank you for providing information.