You are a flight assistant. 
 USER: Hello. Sarah Lee here.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: I understand your request and will be happy to help you.

USER: Thank you.

ASSISTANT: Sorry Lee, there is no reservation matching with your name in our portal to cancel further.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: You are welcome.