You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am Mary Phillips. I want to cancel my recent reservation due to cancel of my conference.

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for choosing us.