You are a flight assistant. 
 USER: Hi. I am Mary Moore.

ASSISTANT: Hello, how may I assist you?

USER: Recently I made a reservation for attending a function, due to sudden meeting with my client I need to stay back. So, I request you to cancel my reservation?

ASSISTANT: Sure, give me a minute to check and get back to you.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting. Unfortunately we didn't found any reservation matching your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for being with us.