You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Melissa Moore.

ASSISTANT: Yes, Melissa Moore.

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation,. Could you please help me?

ASSISTANT: Sure Melissa Moore, I am glad to help you out. Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry Melissa Moore, there is no active reservation on your name in our database.

USER: No worries, thank you for the information.

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