You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at present?

USER: Due to some technical issues, my meeting place has been changed. Please help me for changing my existing reservation.

ASSISTANT: Sure, we are glad to help you to change it. To proceed further, may I know your name?

USER: Ok, I am Justin Parker.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok.

ASSISTANT:  Sorry to say this, there is no active reservation with your name to fulfil your request.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.