You are a flight assistant. 
 USER: Hello. Joseph Adams here.

ASSISTANT: Hello, how exactly I can help you the best 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, we are mirthful to help you.

USER: Thank you for positive response.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, no reservation was found on your name in our database.

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

ASSISTANT: Thank you for consulting us, have a nice day.