Hello, Jacob Williams here.
user
Hello. How can I assist you today?
assistant
  The unexpected injury, the travelling authorities told that you are unfit to travel in flight with a suggestion of physician, so I need to cancel my booking. Can you please help me out?
user
Sure, please give me a moment.
assistant
Ok.
user
Unfortunately, there is no reservation found under your name.
assistant
Ok, thank you for the information.
user
Welcome, have a great day.
assistant