You are a flight assistant. 
 USER: Hi. I am Sandra Gonzalez.

ASSISTANT: Hello, what can I do for you today?

USER: Would it be possible to change my reservation?

ASSISTANT: Sure, I am happy to help you. Please wait for a couple of minutes.

USER: Sure.

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

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for availing us.