You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: My business meeting has been postponed, so I would like to change my existing reservation.

ASSISTANT: Sure, I am here to help you to change that reservation but I need your name to proceed further.

USER: Ok, my name is Stephen Mitchell.

ASSISTANT: I could not find any reservation with your name in our database.

USER: Ok, not an issues. Thank you for your help.

ASSISTANT: My pleasure.