You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand?

USER: Due to some technical issue my meeting place has been postponed, I want to change my reservation. Please help me to change my reservation.

ASSISTANT: Sure, we are here to help you. May I know your good name?

USER: Sure, I am Mark Smith.

ASSISTANT: Sorry there was no reservation on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.