You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you about that. Can you please provide your name for checking the reservation status with your name?

USER: I am John Parker.

ASSISTANT: Please be on hold for sometime to check the reservation status in our booking list.

USER: Sure.

ASSISTANT: I apologise to say this John Parker, there is no active reservation under your name in our booking list. Thank you for reaching us. Hope you have a nice day ahead.