You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: My name is Virginia Gonzalez. I would like to change an existing reservation.

ASSISTANT: Sure, we are here to help you to change it. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: No problem, thank you for the information and time.

ASSISTANT: Thank you for opting us.