You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Margaret Perez. I would like to change my reservation as I am leaving to my hometown, can you please help me out?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please be hold on for a moment and I will check your reservation.

USER: Sure.

ASSISTANT: Sorry Margaret Perez, no reservation has found under your name to change.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure. Thank you for choosing us, have a good day.