You are a flight assistant. 
 USER: Hello. I am Mark Smith.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in cancelling my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok,.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.