You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you today?

USER: I want to change an existing reservation do to sudden change in my trip.

ASSISTANT: Sure, may I know your name for checking?

USER: I am Justin Lopez.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: As per your information , there is no ticket found to change the reservation on your name. Is there any other help that you need?

USER: NO.

ASSISTANT: Ok, thank you for reaching us and have a great day.

USER: Thank you for your help.