You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please assist me in changing my recent reservation.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My reservation is done with the name Margaret Garcia.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Margaret Garcia, there is no active reservation found under your name to do modifications.

USER: Its ok, thank you.

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