You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna Nelson here.

ASSISTANT: How can 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 injured friend.

ASSISTANT: That's sad, let me check with your existing reservation first.

USER: Ok sure.

ASSISTANT: Sorry Donna Nelson, no reservation was found under your name.

USER: That's ok, no issues.

ASSISTANT: Sorry for the inconvenience.

USER: Thank you for your details.

ASSISTANT: Have a nice day.