You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I would like to change my reservation as I have an Urgent meeting at my Office, so help me in changing.

ASSISTANT: Sure, May I know your name?

USER: Sure, my name is Benjamin Miller.

ASSISTANT: Please wait a second. Sorry, No reservation found on your name.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for availing us.