You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I made a reservation earlier to attend for a client meeting, due to some technical issues my meeting has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, please give me a moment. I will check the list and revert you.

USER: Sure, I am Michael Collins.

ASSISTANT: There is no reservation found by your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing us.