You are a flight assistant. 
 USER: Hello. I am Nicholas Collins.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment.

USER: Ok.

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 issue. Thank you.

ASSISTANT: Thank you for choosing us.