You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Mary Collins. I need to cancel my reservation, can you help me out please?

ASSISTANT: Please wait a while. Sorry to say, there is no reservation on your name in our database.

USER: Sure, take you own time. That's ok, no problem. Thank you for help your help.

ASSISTANT: Thank you for opting us.