You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Moore.

ASSISTANT: How can I assist you today?

USER: As my meeting got postponed, can you please help me by changing my existing reservation?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your own time.

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

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Thank you for providing information.

ASSISTANT: Thanks for reaching us, have a great day.