You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Brian Nelson.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure Nelson, please wait a moment.

USER: Ok.

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

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for approaching us.