You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to change my existing reservation, can you please help me?

ASSISTANT: Sure, please specify your name.

USER: I am Anthony Gonzalez.

ASSISTANT: Ok, please standby.

USER: Ok.

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

USER: Ok, no problem Thank you.

ASSISTANT: Thanks for choosing us.