You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I want to cancel my reservation due to sudden postpone of my classical show competition. Will you help me in cancellation?

ASSISTANT: Ok, I can help you in cancellation.

USER: Thank you.

ASSISTANT: May I know your name to cancel your ticket?

USER: I reserved a seat with my name David Thomas.

ASSISTANT: Sorry, no reservation has found with your name.

USER: Ok. Thanks for the response.

ASSISTANT: Thanks for approaching us.