You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joseph Martin here.

ASSISTANT: How can I help you today?

USER: Due to sudden health issue, I am not able to travel in a flight on those date that I want to travel in a flight. Can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, I am mirthful to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database to cancel your reservation.

USER: Oh! I think the ticket was not booked due to server issue.

ASSISTANT: Thank you for approaching us, have a great day.