You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am Patrick Davis. I want to cancel my reservation due to some personal problem.

ASSISTANT: OK, please wait for few minutes, let me check and revert you.

USER: Take your own time.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: OK,not an issue.

ASSISTANT: Thank you, for reaching us.

USER: Thank you for your help.