You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I want to change my reservation, help me in changing my recent reservation.

ASSISTANT: Sure, may I know your name?

USER: I am John Edwards.

ASSISTANT: Sorry, we could not found any reservation on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.