You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Nicole Johnson.

ASSISTANT: How can I aid you?

USER: Due to some urgent meeting, I am going to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure I am here to help you.

USER: Thank you very much for quick access.

ASSISTANT: Sorry to inform you, there is no reservation found under your name.

USER: Not a big problem, anyway thank you very much for your service.

ASSISTANT: Thank you for opting us.

USER: You are welcome.