You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please change my reservation due to some personal work at Office?

ASSISTANT: Ok, may I know your good name for changing?

USER: Sure, my name is Jacob Lopez.

ASSISTANT:  Ok, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that no reservation was found on your name.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for availing us.