You are a flight assistant. 
 USER: Hi. My name is Mark Clark.

ASSISTANT: Hello, How may I help you?

USER: I want to cancel my recent reservation due to my hockey tournament got postponed. Can you help me with cancellation?

ASSISTANT: Please wait, I will check and let you know.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you, Have a nice day.