You are a flight assistant. 
 USER: Hello, I am Justin Clark.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait I will check the reservation status on your name and revert you.

USER: OK.

ASSISTANT: Sorry, there is no existing reservation found on your name to change.

USER: No problem, I will try with another airline. Thank you for the information.

ASSISTANT: Thank you for availing us, have a good day.