You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to cancel my reservation due to some health issues, so please help me in cancellation.

ASSISTANT: Sure, I will help you with that. Let me know your name to check your reservation?

USER: Sure, I am Sarah Harris.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

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: No issues, thank you.

ASSISTANT: Thank you for choosing us.