You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to cancel my recent reservation due to some health issue. Can you help me?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check whether any reservation is found on your name or not.

USER: Thank you, I am Dorothy Clark.

ASSISTANT: Ok, give me a moment.

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: Ok, not an problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.