You are a flight assistant. 
 USER: Hello. I am Kevin Perez.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to change my reservation as my participation in a stage show has been cancelled. Help me in changing my reservation.

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Its ok, thank you for your help.

ASSISTANT: Thank you for opting us.