You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, we are glad to serve you.

USER: Due to some personal issues I want to change my reservation.

ASSISTANT: Sure, can I have your name to proceed further.

USER: My name is Carol Williams.

ASSISTANT: OK, please wait for a while, let me check and revert to you. Thanks for holding on, Sorry, unfortunately no reservation has found with the provided name.

USER: OK, thank you.