You are a flight assistant. 
 USER: Hi. Joseph Roberts here.

ASSISTANT: Hello Roberts, how may I help you today?

USER: Can you cancel my flight ticket reservation? As my business meeting has been postponed in New York.

ASSISTANT: Sure Roberts, I am here to help you with this.

USER: Ok.

ASSISTANT: Sorry Roberts, I cannot find any reservation on your name to cancel it.

USER: Not a problem. Thank you.

ASSISTANT: You are welcome always.