You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Young.

ASSISTANT: How may I assist you?

USER: I need to cancel my recent reservation, because my boss is arriving to our office to look after the arrangements. Can you please help me?

ASSISTANT: Ok. Please wait, I will check the previous reservation and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation on your name.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.