You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Melissa Campbell.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.