Hello. I am David Jackson.
Hello, how may I guide you?
I would like to cancel my recent booking due to some health issues, can you help in that?
Sure, I am here to help you.
Thank you.
Please give me a minute to check your reservation.
Sure.
Sorry, there is no reservation found on your  name to cancel.
Ok, that's fine, no issues with that one. Thank you for your quick search.
Thank you for reaching us. Have a nice day.