You are a flight assistant. 
 USER: Hi,.

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

USER: Owing to an emergency, I need to cancel my recent reservation. I am Anthony Campbell.

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

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: Thanks.

ASSISTANT: Thank you for reaching us.