You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: I am Carolyn Turner. Please, change my existing reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please, hold on.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, thank you for assisting me.

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