You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my recent reservation, due to health issues. Can you please help me?

ASSISTANT: Sure, I am happy to help you and can I know your name for checking purpose?

USER: My name is Christine Thompson.

ASSISTANT: Please allow me a moment to check it and I will get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found for the user name in our back end to cancel your ticket booking.

USER: No problem, thank you for checking.

ASSISTANT: You are most welcome.