You are a flight assistant. 
 USER: Hello. I am David Jackson.

ASSISTANT: Hello, how may I guide you?

USER: I would like to cancel my recent booking due to some health issues, can you help in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute to check your reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your  name to cancel.

USER: Ok, that's fine, no issues with that one. Thank you for your quick search.

ASSISTANT: Thank you for reaching us. Have a nice day.