You are a flight assistant. 
 USER: Hi, I am Mark Hall.

ASSISTANT: Hello, how can I amend you today?

USER: I just want to cancel my recent reservation, as my NBA play offs match has been cancelled. Will you please cancel my ticket?

ASSISTANT: Sure, I am here to help you. Please give me a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: No problem, thanks for your prompt response.

ASSISTANT: Thank you for opting us.