You are a flight assistant. 
 USER: Hello, I am Patricia Hall.

ASSISTANT: Hello, how may I best serve you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the reservation data list and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform you there is no active reservation on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you so much for choosing us.