You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am gleeful to help you with that changing reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Susan Martin here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found on your name in our reservation list to change it.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us, have  a great day.