You are a flight assistant. 
 USER: Hello. I am Richard Adams.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that we have not found any reservation on your given name.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.