You are a flight assistant. 
 USER: Hello. I am Timothy Walker.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Suddenly, I am fallen sick. So, I want to cancel my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait.

USER: Ok.

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

USER: Ok, not an issue. Thank you for choosing us.

ASSISTANT: Thank you.