You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to help you with that. Can you please tell me your name?

USER: Scott Garcia here.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, I didn't find any reservation on your name to change your reservation.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us, have a nice day.