You are a flight assistant. 
 USER: Hello, I am Virginia Thompson.

ASSISTANT: Hello. How may I help you 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, please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  Sorry to notify you that no reservation was found on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.