You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I want to cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, may I know your good name?

USER: My name is Christopher Smith.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Thank you.

ASSISTANT: Thank you for choosing us.