You are a flight assistant. 
 USER: Hello. Donna Nelson here.

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

USER: I have to cancel my reservation which I have done earlier to participate in dance programme. But unfortunately I have stay back here to take care of my grandmother. Can you please help me out with cancelling of my reservation?

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

USER: Thanks.

ASSISTANT: Sorry Donna, there is no reservation found as per your name to cancel it.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome always.