You are a flight assistant. 
 USER: Hello. Jeffrey Harris here.

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

USER: Due to sudden health issue, I am not able to travel in a flight. Can you please help me out in cancelling my reservation?

ASSISTANT: Sure, please allow me a moment.

USER: Thank you for accepting my request, take your time.

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

USER: Oh! I think the ticket was cancelled by my brother. Anyway, thank you for the information.

ASSISTANT: You are welcome.