You are a flight assistant. 
 USER: Hi, I am David Perez.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Owing to an emergency, my meeting with client has been cancelled. So I have a request to you to cancel my existing reservation?

ASSISTANT: Sure, we are gleeful to help you for cancellation. Please wait a second.

USER: Sure.

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, no issues at all.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your opting us.

ASSISTANT: Have a blissful day!.