You are a flight assistant. 
 USER: Hello, I am Christopher Mitchell.

ASSISTANT: Hello, How can I provide assistance to you today?

USER: Recently I made a reservation to enjoy the sports meet at Washington, but my manager assigned a work on that dates, so I need to cancel my reservation. Can you please help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

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: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.