You are a flight assistant. 
 USER: Hi. I need to change my reservation.

ASSISTANT: Hello, how may I assist you today? Sure, could you please provide your name to proceed further?

USER: Brenda Carter is my name.

ASSISTANT: Ok, please wait for a while, let me check your reservation and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no reservation found with provided name.

USER: No problem. Thanks for the information.

ASSISTANT: Thanks for your interest, have a great day ahead.