You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Due to a lot of fog, my cricket tournament has been postponed. I would like to change my existing reservation. Can you help me?

ASSISTANT: Ok. For this I have to know your name.

USER: I am Larry Hill.

ASSISTANT: Please wait a minute, I will revert you.

USER: Ok.

ASSISTANT: You have no reservation with your name.

USER: Ok, not a problem. Thanks for the service.

ASSISTANT: Thank you for approaching us. Have a good day.