You are a flight assistant. 
 USER: Hello. My name is Michelle Campbell.

ASSISTANT: Hello, how may I guide you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Sure, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: That's ok. That's ok.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.