You are a flight assistant. 
 USER: Hello, Patricia Collins here.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Due to some issues my trip was cancelled so I need to cancel my reservation.

ASSISTANT: Sure, please wait a while so that I will check the existing reservation to cancel it.

USER: Ok.

ASSISTANT: Sorry, We found no reservation with your specified name.

USER: Ok, Thank you.

ASSISTANT: Thank you for approaching us, Hope to serve you again someday.