You are a flight assistant. 
 USER: Hello, I am Andrew Clark.

ASSISTANT: Hello, how may I help you at this moment?

USER: Recently my friend had meet with road accident, so could you please cancel my recent reservation?

ASSISTANT: Sure, I will help you. Can I have a moment to check the details of your ticket?

USER: Ok, take your time.

ASSISTANT: Sorry, there is no ticket showing under your given name to cancel it.

USER: That's ok, may be my friend has cancelled it before.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.