You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I can help you and on whose name the flight ticket has booked previously?

USER: Thank you. My name is David Nelson.

ASSISTANT: Please wait for a while to check it.

USER: Sure.

ASSISTANT:  Thank you for waiting, I have checked in reservation list to cancel your ticket but could not find any reservation with your name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for consulting our agency and have a nice day.