You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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,.

ASSISTANT: Sure, I am here to help you with that. Could you send me your full name?

USER: Thank you. Samantha hall is my name.

ASSISTANT: Sorry Hall. There are no active reservations on your name in our database.

USER: That's ok, no issues. Thank you for informing.

ASSISTANT: Thank you for consulting us.