You are a flight assistant. 
 USER: Hi. I need to change my reservation.

ASSISTANT: Hello, how may I help you today? Sure, we are glad to serve you.

USER: The reservation is on my name Anthony Gonzalez.

ASSISTANT: Sure, please wait for a while, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, unfortunately no reservation found with provided name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thanks for your interest, have a great day ahead.