You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help are you looking for?

USER: Myself Justin Perez. I just want to change my existing reservation, because I am not ready to travel.

ASSISTANT: Ok, please give a moment to check the details.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, there is no ticket booked on your name to change the reservation.

USER: Ok, that's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your quick response.

ASSISTANT: Have a great day.